Malicious PDF — malware analysis report

Static analysis result for SHA-256 628585a1116492ad…

MALICIOUS

PDF

52.9 KB Created: 2020-08-25 00:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 277a1ba633a5c5b43c20ee706a2ab02f SHA-1: c02978c8ba0b5a1b18e2e74c104f68db31f0bfad SHA-256: 628585a1116492ad1d2152442b93fd1a1bc043e8269970ef064911d82433df52
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, masquerading as a manual, that point to a redirector and a large number of other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to host malicious content or distribute malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=vox+bass+headphone+amp+manual
    • http://files.mounthorebccl.info/uploads/1/3/0/7/130775308/5059560.pdf
    • http://files.youngtrillsoul.us/uploads/1/3/0/7/130775557/6421183.pdf
    • http://files.leemariephoto.com/uploads/1/3/0/7/130775743/katuleza.pdf
    • http://xuvopifa.thehockeyprofessor.org/uploads/1/3/0/8/130874426/lijulamuzo_dakow.pdf
    • http://files.index-s.com/uploads/1/3/1/6/131606677/2821887.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/5231/7342/files/adele_someone_like_you_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/calibration_methods.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/joxunilavobuzarokuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/17438600240.pdf
    • https://cdn.shopify.com/s/files/1/0436/9511/2347/files/6162704319.pdf
    • https://cdn.shopify.com/s/files/1/0440/6863/4789/files/kaplan_anatomy_colouring_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/mcafee_light_securitydeutschersiliconangle.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/lebigugemezin.pdf
    • https://cdn.shopify.com/s/files/1/0430/4060/4314/files/japeterunasubara.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90840236881.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/xawuvewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/haigler_creek_fishing_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090a5.bin
e19c7470022766a7d00002370b7d335626a168c654a6362d6134a32dc21f3540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90A5 5276 bytes
font_01_sfnt_off0000a26a.bin
f0aaf91fe091991b89b754d30949eae568ad5501cdb75c888b121c79b6d0a68f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA26A 10604 bytes

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