Malicious PDF — malware analysis report

Static analysis result for SHA-256 a450ffdbf80dc9ff…

MALICIOUS

PDF

49.4 KB Created: 2020-11-04 04:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dc4954226c2cacdc30ab3d3748e45735 SHA-1: 14aa2b17cdf7cb0a5bbea65bba910d82b536e061 SHA-256: a450ffdbf80dc9ff7d00fde898c088699f4b27c35eb34ccdc828eb3d768ecaa6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the nature of the embedded links suggests a malicious intent, likely to redirect users to phishing sites or malware downloads.

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://ggtraff.ru/aws?keyword=civic+leadership+academy+uchicago In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f870ca1ece07.pdfIn PDF document text
    • https://susetizumuru.weebly.com/uploads/1/3/4/4/134461935/wapago.pdfIn PDF document text
    • https://telenegogak.weebly.com/uploads/1/3/4/5/134522167/a85df5b370912d.pdfIn PDF document text
    • https://seguronudolag.weebly.com/uploads/1/3/4/4/134468074/xidemer_gogad.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/vumibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380540/normal_5fa02c71de31a.pdfIn PDF document text
    • https://puxugewukuniw.weebly.com/uploads/1/3/4/4/134492634/9aff64d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405922/normal_5fa1ee07a81cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cd060711-338b-4dbf-b970-09842eeba665/kinufo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9051/9221/files/balanitis_nios_tratamiento.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9778/7035/files/bead_of_force_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27302a28-c7d5-438e-8daf-bae3273b7f08/17639024822.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7426 5368 bytes
SHA-256: 7e110d885166cc98bf1e980c026514e937801fe9e0aaeac586efd010c40988a3
font_01_sfnt_off00008666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8666 10496 bytes
SHA-256: 8c9d36814e9c421d2d0712c7f6387716aa08c498a1332e1a34221dd6ae536fcc
font_02_sfnt_off0000aa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA5D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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