Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e8c077d2c77f0a…

MALICIOUS

PDF

47.9 KB Created: 2020-07-29 15:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c1aebb2e9939aac8821fe6d8b6dbb8d SHA-1: 5d7e8f0eb289d77fa24caeebf80001176acc0085 SHA-256: a7e8c077d2c77f0a680a6c01d7e0f8a54b60f51d005cb08c64308d0ec1e525b8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, suggesting a potential distribution or redirection mechanism for malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated.

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=metode+systematic+random+sampling+pdf
    • http://files.thedogbedcompany.co.uk/uploads/1/3/2/7/132712080/4071462.pdf
    • http://files.ridgeandvalleyforest.com/uploads/1/3/1/4/131413718/86771eab2dc.pdf
    • http://files.jockmuir.com/uploads/1/3/2/8/132814680/jojorukabinose_dejoxud.pdf
    • http://files.southernpridedesign.com/uploads/1/3/2/6/132681415/1539950.pdf
    • http://files.jockmuir.com/uploads/1/3/2/8/132814680/jojorukabin
    • https://cdn.shopify.com/s/files/1/0438/6501/4437/files/28572345070.pdf
    • https://cdn.shopify.com/s/files/1/0429/2821/0073/files/sebewijitumu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8274/files/satuke.pdf
    • https://cdn.shopify.com/s/files/1/0430/7641/9744/files/94933040000.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/xajufegumodifutavetuduxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/gimosafivutenuparowovos.pdf
    • https://cdn.shopify.com/s/files/1/0435/1390/5311/files/dojudefafubuxu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3294/files/47885065382.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/regemasaduben.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/xuxudopadarun.pdf
    • https://cdn.shopify.com/s/files/1/0441/1251/1128/files/71601903335.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19941062624.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/xiwalososegomisamoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/9387/6118/files/53384853864.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_off000077b8.bin
49b0760d8b150dd53dd6fb75aa0096b52bc4a81e7533a4f5897c403cafa5d23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B8 5368 bytes
font_01_sfnt_off000089f0.bin
daeee36f41e8890647a72d99bbcbd6ea93009b784c39321de55928f382b20e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89F0 12552 bytes

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