Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf471422fe47f53…

MALICIOUS

PDF

49.0 KB Created: 2020-08-06 02:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c1e0d4322690bda318809d2cd9039f SHA-1: c54965b80a18b0e8e458a0a71b560bf9a94c7dcb SHA-256: 7bf471422fe47f53a589058ee6aa5b65d8121cc8f47c43ff5d9d89e0d49a1ecc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at 'https://ttraff.com/pify?keyword=chronic+stable+angina+pdf'. This suggests an SEO poisoning or link farm attack, where the document is designed to drive traffic to malicious infrastructure by appearing to offer relevant content. 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.com/pify?keyword=chronic+stable+angina+pdf
    • http://files.srilankaatours.com/uploads/1/3/1/4/131453733/6392258.pdf
    • http://files.foxsmama.ca/uploads/1/3/1/4/131437074/buzejezaxez.pdf
    • http://files.biblebaptistchristianschool.com/uploads/1/3/1/3/131398504/2498410.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/67743155626.pdf
    • https://cdn.shopify.com/s/files/1/0437/4118/4165/files/pokemon_showdown_hack.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/godoziniru.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9493/files/25070363958.pdf
    • https://cdn.shopify.com/s/files/1/0450/9057/0405/files/toro_wheelhorse_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/6236/1245/files/pipamozesowebobiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0120/8232/files/30093721237.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdf
    • https://cdn.shopify.com/s/files/1/0441/3777/5256/files/40539099314.pdf
    • https://cdn.shopify.com/s/files/1/0427/8570/2054/files/ford_4500_backhoe_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/the_sound_and_the_fury_characters.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43127542751.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/gabexukekawixoxokel.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b9.bin
996eeb1c0edc945c996f8de0cce755b813f581d4343f341a43dbf16898a547e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B9 5368 bytes
font_01_sfnt_off000084e6.bin
7f4827ee3eb3c118ac1cf49304907cd7105337f9926bdfd0dd2be4019ab53e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84E6 10948 bytes
font_02_sfnt_off0000a94b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA94B 4324 bytes

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