Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf7a925d70fee46…

MALICIOUS

PDF

48.9 KB Created: 2020-08-06 13:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e586548f9b6d79a7fe2a8cac819b8672 SHA-1: e176584a75285289a0eabbb0263655629c386e9b SHA-256: cdf7a925d70fee46e5b3bc7dbd971ab3391920ea95ba02fd0f923665f3a58a3c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous links, with one specifically identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The primary malicious IOC is the redirector URL, https://ttraff.cc/pify?keyword=anti+resonance+circuit+pdf, which likely leads to a further malicious payload or phishing page. The document body, though heavily obfuscated, contains this URL and other links to Shopify-hosted PDFs, suggesting a link farm or redirection tactic.

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/pify?keyword=anti+resonance+circuit+pdf
    • http://files.designsbycarolann.com/uploads/1/3/0/8/130814513/ac27058e6e8.pdf
    • http://files.blue-house.org/uploads/1/3/1/4/131437689/xokiremusaka.pdf
    • http://files.plainfieldgirlscouts.org/uploads/1/3/0/8/130813692/julodelarukat-kadovejexabo-fefuwiw.pdf
    • http://files.maryjanecampbell.com/uploads/1/3/0/9/130969301/708a1a50.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/33542863941.pdf
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/20429767016.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/19252536586.pdf
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/guguzulabujuvuvonofanawe.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/gogemefenawuxofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9164/files/83820662858.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0432/7312/6052/files/taxivukewutisipotujudim.pdf
    • https://cdn.shopify.com/s/files/1/0430/8136/7712/files/tudenutigirapub.pdf
    • https://cdn.shopify.com/s/files/1/0431/3323/9457/files/ronibujez.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7351/files/78575570791.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/51375508762.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_off00006aab.bin
04b5b6c18f0982c71ee150cacbb5cbf896dda5e3217e9ee9705834a03e758347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAB 5104 bytes
font_01_sfnt_off00007c17.bin
0e1a4c9addef73b0d57b46883e478355346801fb049259079e2ea9ab980d032b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C17 10792 bytes
font_02_sfnt_off0000a12a.bin
f2252027cd5e550c947716d4e80663ebf59ba5f8596e08a92bb55263fc8dc32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA12A 16188 bytes

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