Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7ebc8078e13db3…

MALICIOUS

PDF

37.4 KB Created: 2020-08-30 05:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd69fa4db7622ea86ec2b59485b68e9e SHA-1: 7cbcb7edf8e17a1ef943922316a40c3f7b4e8a20 SHA-256: 0b7ebc8078e13db3fe8ce8d177052222b36394c601a46922e1727fc4dff79860
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=entity+mischief+free+download'. It also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic. The document body contains the malicious URL and a benign-looking PDF URL, likely intended to trick the user into clicking the malicious link for a 'free download'. No scripts were extracted, but the presence of embedded URLs and the redirector heuristic strongly indicate a phishing or scam attempt.

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/wix?keyword=entity+mischief+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6803/8047/files/nero_stard_smart.pdf
    • https://cdn.shopify.com/s/files/1/0431/7655/8746/files/98296259547.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3352/files/past_present_and_future_tense_worksheets_esl.pdf
    • https://cdn.shopify.com/s/files/1/0437/9662/7616/files/1480610910.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/cataracte_congnitale.pdf
    • https://static.usrfiles.com/ugd/b8c837_36cfaeb8f915466e806fbb61604331fb.pdf
    • https://static.usrfiles.com/ugd/451461_f25e81bc22c245c99ca21cf8f71db807.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://static.usrfiles.com/ugd/b8c837_b141bc19f86a429baf8c81e42b40d6e9.pdf
    • https://static.usrfiles.com/ugd/83e24f_361f811af74c4777b2cd652d921a8243.pdf
    • https://static.usrfiles.com/ugd/97634b_e0c88cd9158948cea034e71b0d18e0b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9830e9745a504edab2f981aeb841c809.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/carbetocina_farmacocinetica_y_farmacodinamia.pdf
    • https://cdn.shopify.com/s/files/1/0429/8165/4687/files/38145979806.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_off000053bd.bin
9dd3f08616a1c1905353702155cd20d60a5a0fcb1c8d6450541cb73d3c9dbac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BD 5412 bytes
font_01_sfnt_off00006607.bin
b8b72624bcfd906d14b66f322ab11867064ad0d14c2e09aed883e15242e576be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6607 10216 bytes

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