Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad4f5299831456e…

MALICIOUS

PDF

47.8 KB Created: 2020-07-24 19:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c04e99e90919b7e592132dba1ff947c SHA-1: e2ba5b8e4a8140cba6688a68bab3c6a9099efcda SHA-256: 7ad4f5299831456e3ef875bd2456ad20f2feef227443bbc78bd3a9287379f0eb
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 of which point to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=god+of+war+ascension+java+game', is flagged as a malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically.

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/pify?keyword=god+of+war+ascension+java+game
    • http://files.sherwingaje.com/uploads/1/3/2/7/132712119/dakexutus_zujetijapel.pdf
    • http://files.shynelleagaran.com/uploads/1/3/0/8/130814907/a319b6923e659.pdf
    • http://files.armstrongfami.com/uploads/1/3/2/8/132814286/1867318.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/12920779146.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/sikigakugu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/xaxobakuxatir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/16888960079.pdf
    • https://cdn.shopify.com/s/files/1/0433/4374/1083/files/30462145979.pdf
    • https://cdn.shopify.com/s/files/1/0431/7223/3380/files/gopejexifisoteka.pdf
    • https://cdn.shopify.com/s/files/1/0431/9654/7230/files/98459217158.pdf
    • https://cdn.shopify.com/s/files/1/0428/6860/5095/files/59372956563.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dejozetopugewafapo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6863/files/2957600104.pdf
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/91010948928.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/nugevogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/gemuweriniwozasadigoxi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6905/5911/files/93817408730.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_off00007d63.bin
09764ebdd46bc64cd4be7e35c1eef55d2c2f13f703198b1bcc8fae4fa95d7b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D63 5276 bytes
font_01_sfnt_off00008f57.bin
9a746ef1a4241826f50ffbf1aa4734cc1e6504a7865363ba3b34c7854d6352cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F57 10180 bytes

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