Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc18b80ec80c709…

MALICIOUS

PDF

41.1 KB Created: 2020-08-20 03:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8bca73ed2c5c7b0e1f5e40b19624adf SHA-1: 020a5391b2a2773f308cd3c0661abdd74de54b45 SHA-256: 8cc18b80ec80c709e28be468c8b993efc33ca016818767b0c5838682c0642ae2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Ankylosing spondylitis spine deformity' and references wkhtmltopdf, suggesting a lure for SEO poisoning or phishing. The presence of a link farm further supports this attack pattern.

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.com/pify?keyword=ankylosing+spondylitis+spine+deformity
    • http://jupifa.lemoine.us/uploads/1/3/1/8/131871674/lapikis-fomelamodamum-moxosugopazi.pdf
    • http://files.2200firstseattle.com/uploads/1/3/1/6/131636819/xotilififixam-xajovezuveg-letalezi.pdf
    • http://files.str8coastin.com/uploads/1/3/1/4/131483361/najobajupuwoxo-pamodegujodava.pdf
    • http://vajup.dongpu.studio/uploads/1/3/1/8/131857758/zimotasom-tukibunutiru-mebuzulusigodos.pdf
    • https://cdn.shopify.com/s/files/1/0432/0346/1283/files/89163709926.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/grade_1_english_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/51822471851.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/vaxamezivaritokidewudif.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/bujeliduvenejavanuwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/5726/5305/files/workplace_safety_inspection_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/70453027277.pdf
    • https://cdn.shopify.com/s/files/1/0437/8450/3453/files/mst3k_space_mutiny.pdf
    • https://cdn.shopify.com/s/files/1/0428/5703/7990/files/91706841637.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/astronomy_olympiad_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/wuvalabonanazapajixuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6241/files/semozutexamer.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061bf.bin
070c8217c7f078491e3ceabbd248b47652da47afbed71db8943cd85d9662e53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 5308 bytes
font_01_sfnt_off000073c5.bin
76a5695a04f26908f9f45caa190cf76a02046e543554fe3cbcc52af319c97e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 10500 bytes

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