Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fa459cf370d9c5…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 15:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e3ec7601059ea52cee8a9ccd46e4a4 SHA-1: d8d05172133ac68a5f2126f9d0cfa2e2c40f4fc3 SHA-256: d9fa459cf370d9c5dd4d0e03a8baa94c14596a9ca05ef4719af1d62e71c3f33c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by an ML classifier and contains a link to known malicious redirector infrastructure. It also features a large number of external links, many pointing to Shopify domains, suggesting a link farm intended to obscure the ultimate destination. The primary malicious URL is https://ttraff.ru/wix?keyword=the+crucible+conclusion, which is likely used for phishing or malware delivery.

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/wix?keyword=the+crucible+conclusion
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/balance_general_proforma_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/1094/0328/files/biochemistry_notes_for_bsc_nursing.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0434/6046/0706/files/benewunur.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/heartworm_society_guidelines_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0440/6296/5912/files/47625043551.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fbb4db14bcf4200b898f6145b9b1716.pdf
    • https://static.usrfiles.com/ugd/b58d21_121e42162ff64886a98a441c373997e5.pdf
    • https://static.usrfiles.com/ugd/3eed2b_910140aa704747dba04cb690c73953ad.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/29744428345.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/39825674886.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_off00006708.bin
bb0fea0d48fd4c9596a804992df2d4260e1c0e8e00ebc2578d95289a0614bda2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6708 4768 bytes
font_01_sfnt_off0000772b.bin
3e2ec0184e0bbc4db7b0fa9f3653ce300aa52ba0a93508a30322c6a196c880e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772B 9920 bytes

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