Malicious PDF — malware analysis report

Static analysis result for SHA-256 7103427948eb6348…

MALICIOUS

PDF

37.3 KB Created: 2020-10-28 21:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 66460863220de42be3f1ceff097db2d0 SHA-1: 84de460251126fcb1435f7d2aad4c2af1ae1f551 SHA-256: 7103427948eb63488d9e69cd3b6b71ea00f68f2a48b3962b172165eb53c55a4e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=atomic+radius+carbon+aluminum+oxygen+potassium', which is likely used to redirect the user to a malicious site. The presence of numerous links suggests a link farm or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=atomic+radius+carbon+aluminum+oxygen+potassium In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_5f986c15767b7.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/acdf76d66f1b8.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/8019579.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/c1b7697c8cd58.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/daxasolizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_5f8f49bb4777e.pdfIn PDF document text
    • https://gijepeparo.weebly.com/uploads/1/3/4/3/134318767/5c3bbcf7fbae93.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/9752e3beb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f8c1c713f8c3.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/wewinaxanupava.pdfIn PDF document text
    • https://zoxetojasag.weebly.com/uploads/1/3/1/4/131437223/zozok_ripefezelidotu_lesojovi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_5f946c2f92f69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f91e71e6df90.pdfIn PDF document text
    • https://beperiguvo.weebly.com/uploads/1/3/4/3/134320750/9696881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f94b5b676c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5f908c78919ca.pdfIn PDF document text
    • https://xukaxikerebata.weebly.com/uploads/1/3/4/0/134042698/9242164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5f969694663ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_5f97219dd7317.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7262/5058/files/vietnam_a_natural_history.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3879/1582/files/download_novel_wuthering_heights_bahasa_indonesia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/3d_stress_tensor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0c8d009-96c7-4075-a96a-e11822c2434b/36604261088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2278/6975/files/smithtown_high_school_west_ranking.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1690/2583/files/uniflame_2_burner_gas_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cfed1f-3782-4478-9bbe-eb69eb65fcc8/13371637471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62d2659-2f01-4c80-bc58-9600ffdd0eca/32251733029.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000551d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x551D 5692 bytes
SHA-256: 53377e3e0294036ae8bcb8e55dc92451a4d26b9dd554dcc7bba92397c9331346
font_01_sfnt_off0000686f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x686F 9064 bytes
SHA-256: ab472f927a978c64aecfaeb87c017883becba91b55507acf5ea6cbedc9aea508

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