Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d6d3671518d2b…

MALICIOUS

PDF

41.6 KB Created: 2020-10-27 01:15:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2ff4ea1b75cd0ade725bf5db900f63fc SHA-1: 8807359cf055e10bca7ca6f39d963cd4ff60cb7c SHA-256: 790d6d3671518d2b57f97b8d4529cf46d0b1370155b39834d343d2de501c5693
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, designed to create a link farm. One prominent URL, 'https://ttraff.com/123?keyword=whirlpool+gold+series+oven+manual+aqualift+self+clean', is flagged as a malicious redirector, indicating a likely attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.com/123?keyword=whirlpool+gold+series+oven+manual+aqualift+self+clean In PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/3f295ca1.pdfIn PDF document text
    • https://widubemevojapo.weebly.com/uploads/1/3/4/3/134320166/18bb7.pdfIn PDF document text
    • https://wobafedufuj.weebly.com/uploads/1/3/4/0/134012960/sabilevap.pdfIn PDF document text
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/d98de1e087554d.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/29cce56f8fc85.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/2122744.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/lafika.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/9308762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abdad1d-cc64-4f63-997e-18c4bb1f107d/51853485835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c464bb8-660a-46d1-8d8c-b86dc8db173f/wedding_bells_magic_spells.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a482e406-8ac6-4994-a7c9-f802f18c89cf/zewuradifepuwezeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4839/4663/files/bruce_lees_first_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7713/0658/files/20929624663.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9191/3632/files/olympus_omd_em5_mk_ii_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172063e0-dd44-4e6c-9a68-810275a78614/nodezobafupugunokoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80f40aa0-a8ad-43da-87b8-1656bb27ea6a/80525695364.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_off00006247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6247 5768 bytes
SHA-256: 1b3f4162fa218e130716f2747ece6f5fc873602c636f829e82d6614c0f76d835
font_01_sfnt_off000075c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75C5 10424 bytes
SHA-256: 9d1972fa9048e19a1d22dbe651fc7464ad11879adb17336e7256c7978e39f1c7

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