Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c7b3bd06c3e5cc…

MALICIOUS

PDF

44.3 KB Created: 2020-08-16 11:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07be7dc62d632749e69eecf87b18a45 SHA-1: ea8990b542ca6058d6fb9d0b3013e461f2247e70 SHA-256: 88c7b3bd06c3e5ccc00691c291fd89ba0703fe00f336a4add0249875740d8e80
150 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with one link identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content. The document body contains garbled text and embedded URLs, reinforcing the link-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=chylous+ascites+pdf
    • http://files.normajeanreiki.com/uploads/1/3/0/9/130969003/848876.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3586/files/vitufeweletapotudamotaged.pdf
    • https://cdn.shopify.com/s/files/1/0439/1718/1083/files/18308753519.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/manual_bls_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6690/files/harmony_650_software.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5788/files/xikojolasilogolazap.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/17502197150.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/6932377875.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/giwiwanabol.pdf
    • https://cdn.shopify.com/s/files/1/0440/0683/4334/files/campfire_songs_chords.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007115.bin
feafecaab12ba64afd4ae8fb005246eda474f68e5c806681051f287de476d102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7115 5156 bytes
font_01_sfnt_off000082a8.bin
412885dc61ddd19c08a8837755de56c53395dde858c67dd5735ffd5069cc6a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82A8 10140 bytes

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