Malicious PDF — malware analysis report

Static analysis result for SHA-256 144c8653d4544959…

MALICIOUS

PDF

47.9 KB Created: 2020-08-06 11:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa3bd7631a53297b9370cd6e0d63a0d8 SHA-1: 8f72f59b58bb22d7b65fc0a416baeb21f471b6a6 SHA-256: 144c8653d454495977287cc54ebca7b4d9b46b472f4afe65722bdf5fbe404e90
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, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=sample+math+aptitude+test+questions+and+answers+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URL and other Shopify-hosted PDFs, indicating an attempt to drive traffic to malicious infrastructure under the guise of providing test questions.

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=sample+math+aptitude+test+questions+and+answers+pdf
    • http://files.dndleather.com/uploads/1/3/1/3/131379546/nimutora.pdf
    • http://files.msqg.org/uploads/1/3/1/1/131164431/2cb173b042.pdf
    • http://files.similandiveguide.com/uploads/1/3/2/6/132681586/nuriforuruvematanavu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/84995754381.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/lutivafenuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/zitowifevef.pdf
    • https://cdn.shopify.com/s/files/1/0431/4601/8967/files/zimugubukemoto.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/31209118336.pdf
    • https://cdn.shopify.com/s/files/1/0434/4227/4471/files/69963031097.pdf
    • https://cdn.shopify.com/s/files/1/0433/3010/9593/files/dmv_new_kensington.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/jadebetabud.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/96417137168.pdf
    • https://cdn.shopify.com/s/files/1/0435/0397/6614/files/22396157626.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d07.bin
a7498f69cb4c88af98e45645981cbad00016fad73a44a248e7bad0d2fdb793b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D07 5484 bytes
font_01_sfnt_off00007f88.bin
f6a1c401931977a73a5c56f2d6ecf45d0a31e8ec3b5fade287fc3fb44b043543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F88 10876 bytes
font_02_sfnt_off0000a46a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA46A 4324 bytes

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