Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ac81202b87db60…

MALICIOUS

PDF

49.5 KB Created: 2020-08-03 06:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2fef66e5db8eb29e144776b1ced8c3e SHA-1: 0563c9ae6acf812f1683685ba1b4f2b2aa073113 SHA-256: 61ac81202b87db6070132b96634438ad9a6a54d075dfb7b3bdf88a818b9be3dd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, which is characteristic of SEO poisoning or link farm abuse. One of the primary links, 'https://ttraff.com/pify?keyword=nested+functions+python', is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to malicious infrastructure.

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=nested+functions+python
    • http://files.khandala.co.uk/uploads/1/3/1/4/131453432/b35f9.pdf
    • http://files.llkobe.com/uploads/1/3/1/1/131164569/1734602.pdf
    • http://mudaw.fern45.com/uploads/1/3/1/0/131070718/mimalabulodizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4133/3147/files/58377099601.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/fallout_4_best_enb.pdf
    • https://cdn.shopify.com/s/files/1/0438/8785/3720/files/89692930214.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/88156243515.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/28924901054.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/sepudamapode.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/90311779325.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/57138059300.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/15450684144.pdf
    • https://cdn.shopify.com/s/files/1/0435/0545/1174/files/22030119917.pdf
    • https://cdn.shopify.com/s/files/1/0436/5372/6358/files/67339368893.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5078/files/59719747921.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/wobisekufeboxoxi.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_off00007547.bin
b24df815aa5ebfc81c9e6691b0afea006e91de7a84ab0c69d5b3005e83fd6245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7547 4976 bytes
font_01_sfnt_off0000864d.bin
db1a5d359c716b2b7cd90669f3f6c4e42506ba3406a2a611c6eda3485730ac11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x864D 15428 bytes

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