Malicious PDF — malware analysis report

Static analysis result for SHA-256 73809ef32538bd7b…

MALICIOUS

PDF

44.5 KB Created: 2020-08-09 08:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdd3076888137a70743a80a5187f84da SHA-1: e03a97128e1158b674052e0900ffd8cff7dfad95 SHA-256: 73809ef32538bd7b04281d98f6156f5c520e4664108b09f11d1689d71d55726d
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector known to host malicious content. The document body also contains a URL that is part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of callback phishing lures further indicates a malicious intent to engage the user.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=apicultura+costa+rica+pdf
    • http://files.deemaciephotography.co.uk/uploads/1/3/1/8/131872055/9255341.pdf
    • http://gitizota.bellabirth.org/uploads/1/3/1/4/131438477/wofukijav.pdf
    • http://files.reversac-traductions.com/uploads/1/3/1/4/131437044/2785849.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/65178783129.pdf
    • https://cdn.shopify.com/s/files/1/0436/6984/8217/files/mixed_present_tenses_exercises_with_key.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/17799114240.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/71334624635.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/19389742857.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nejoxalivivurotuzepebibus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/23949759076.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/rabuzonu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/5989/files/karixowatevejilepipamad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6755/5481/files/26510115412.pdf
    • https://cdn.shopify.com/s/files/1/0428/4101/4438/files/vakuwaromubil.pdf
    • https://cdn.shopify.com/s/files/1/0429/3178/1791/files/faronojomaruvoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4717/4822/files/pizoximazerixu.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_off0000703d.bin
92765c72519770914f0b4fb112b6f72e05ff00df89c9cd15428b460dafeca512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703D 5140 bytes
font_01_sfnt_off000081c7.bin
72c88535429eae92152077e86ef1f701d9e092c687836c141c0356bf21996300		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C7 10428 bytes

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