Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f6506db3ac5f2c…

MALICIOUS

PDF

38.4 KB Created: 2020-08-29 17:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19a63a08e33a36ee4aea34f7a2e10b70 SHA-1: cb82e11638109fe5d4c164c0c862a4a7714f8008 SHA-256: 15f6506db3ac5f2cadb857322820949e9b5f248ce55b4cbd0f0e471204231db7
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 domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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.cc/wix?keyword=international+financial+management+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/risekumomivedopela.pdf
    • https://cdn.shopify.com/s/files/1/0448/5169/1681/files/umayyad_caliphate.pdf
    • https://cdn.shopify.com/s/files/1/0432/6054/3138/files/48915502167.pdf
    • https://cdn.shopify.com/s/files/1/0435/5804/3807/files/laboratory_exercises_for_electronic_devices.pdf
    • https://cdn.shopify.com/s/files/1/0439/6918/3902/files/wevexudimede.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2645/files/zuxovujonubaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/7047/8746/files/50065840006.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5813/files/kotunejobu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/79049514698.pdf
    • https://cdn.shopify.com/s/files/1/0431/0538/6657/files/felelupe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/42247666916.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/47270999673.pdf
    • https://static.usrfiles.com/ugd/b8c837_c53fce6494ad447ebf461da4fc0fe626.pdf
    • https://static.usrfiles.com/ugd/b8c837_04c8d2ed750348cc964112c5802ceda1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2ea90ecca954ddb8538d840114365d5.pdf
    • https://static.usrfiles.com/ugd/5360f8_bfddb313bef340539c13428fcf7c6f59.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_off00005862.bin
d1351532c8bc075bcc721f2c7f4c30651637241e3895992c2d6febe17c6c20ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x5862 5040 bytes
font_01_sfnt_off00006979.bin
fe5c6f5fa426eae8c2424e47950b1228d4222cc1a0bcdb3a70f3bbd4f120b342
pdf-font-stream PDF embedded font (sfnt) at offset 0x6979 10488 bytes