Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98140da5e483f01…

MALICIOUS

PDF

42.4 KB Created: 2020-08-19 17:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d055f646af0408008f33cd6d70c8c9d SHA-1: 66de44d2e86252905fc9387632888fc1109a7981 SHA-256: a98140da5e483f01ad841a59bb2e0602a006cb32c3407cc16b294dad982c0c2c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to containing a large number of external links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.ru/pify?keyword=bidesiya+bhojpuri+movie+free, which is likely used to obscure the final destination. The document body contains garbled text but also includes the same malicious URL and several other PDF links hosted on Shopify, suggesting a link farm or SEO poisoning tactic. No scripts were extracted from this sample.

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/pify?keyword=bidesiya+bhojpuri+movie+free
    • http://files.madamedrydensgrade5class.com/uploads/1/3/0/8/130813317/5ebfcce8ed.pdf
    • http://files.tobiasinnola.com/uploads/1/3/2/7/132740580/terumejodati-dilaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/26163276294.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2033782386.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/dobomenunera.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/50116918698.pdf
    • https://cdn.shopify.com/s/files/1/0436/1699/3440/files/63391944363.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/34341127239.pdf
    • https://cdn.shopify.com/s/files/1/0438/8562/5499/files/l_amandier_au_maroc.pdf
    • https://cdn.shopify.com/s/files/1/0436/1525/6738/files/41631493241.pdf
    • https://cdn.shopify.com/s/files/1/0439/4565/6488/files/80087398549.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/xubidafubuvigepeseka.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_off00005f13.bin
aaf4773913629abc1edb43bb6c0346f3385498d4e84d32191df479bc0eac5205
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F13 5676 bytes
font_01_sfnt_off0000724b.bin
8cb2e042c87bc8a4db8f763f34b6ec363dfa0c3452ef714986a4dba629846268
pdf-font-stream PDF embedded font (sfnt) at offset 0x724B 13564 bytes