Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ea3a72b0d04492…

MALICIOUS

PDF

49.2 KB Created: 2020-09-11 08:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: efeaaeef04cc8515004186d54525d79a SHA-1: 1c11c1db46d0c23802f6553eee80763497a34cbd SHA-256: 27ea3a72b0d0449271800687b0adf6e9f81399395790e6f05d38c899be051ee0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The primary malicious link identified, 'https://ttraff.club/pify?keyword=student+details+form+template', is designed to appear as a legitimate form but redirects to malicious infrastructure. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is part of a phishing or redirection scheme.

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.club/pify?keyword=student+details+form+template In PDF document text
    • http://files.zamdevelopsj.org/uploads/1/3/1/1/131164534/7449164.pdfIn PDF document text
    • http://files.drweng.net/uploads/1/3/0/7/130738939/f36f53d.pdfIn PDF document text
    • http://novamux.bonuselkantler.com/uploads/1/3/0/7/130775200/botalerixosite-zijofamun-jekewedo-zodivavoxaguxer.pdfIn PDF document text
    • http://kogivekop.scatkofamilychiropractic.com/uploads/1/3/1/0/131070374/gafak.pdfIn PDF document text
    • http://files.insidedmc.org/uploads/1/3/1/6/131636772/ruronativuxaje.pdfIn PDF document text
    • http://files.southernor.com/uploads/1/3/0/8/130874382/6aaa78c97f58f.pdfIn PDF document text
    • http://files.greenvillecounseling.com/uploads/1/3/0/7/130775851/e89e6534713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/13ae68_a899e33e7b8149d38a7e11410f58b616.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_10e4e40a9edd4ea1b733539b80fc4242.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/afe78f_e8d393b6342e44339d054b980778690f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8d0191_3ab8da91afad486db7716cca72a1af71.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8b97dd_ae13fdee2a17487c82657666f79edc61.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/1482/7677/files/b._p._ed_books_in_english.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1908/2655/files/refogu.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_off00007290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7290 5292 bytes
SHA-256: d4ce221b691717c2f1a4907dbca0f50f229130e952d204b96e5909a86b00032c
font_01_sfnt_off00008479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8479 15988 bytes
SHA-256: 420e0ba1621ad6be3e61cded199af08805381d9a2f1f83a166913116b55ed416

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