Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95ce2224d66f832…

MALICIOUS

PDF

47.3 KB Created: 2020-08-06 13:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c8063655c2f6514fedec5c3c2b6597d SHA-1: 8aef6531aaa2f1857534e712f125cb963a9d7f5a SHA-256: f95ce2224d66f8329d7a5e4c96ed239bda01686691558e0db6c785cb7d02f4fb
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other links, including many to Shopify-hosted PDFs, indicates a link farm or redirection strategy to obscure the ultimate malicious destination. 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=dual+energy+xray+absorptiometry+pdf
    • http://files.hobbyhistorica.com/uploads/1/3/0/7/130740571/1004446.pdf
    • http://files.lutzka.com/uploads/1/3/1/0/131069781/bidit-xemojegatopufir-defifexe.pdf
    • http://files.opadental.com/uploads/1/3/0/9/130969358/jawidunujoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8637/files/65565064132.pdf
    • https://cdn.shopify.com/s/files/1/0432/7197/9171/files/59207441742.pdf
    • https://cdn.shopify.com/s/files/1/0432/8924/7894/files/4127356231.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6105/files/extra_class_license_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/4303/5048/files/princess_mononoke_soundtrack.pdf
    • https://cdn.shopify.com/s/files/1/0439/2475/0491/files/vewenilefap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/visaboxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/60702463133.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/deductive_bible_study_method.pdf
    • https://cdn.shopify.com/s/files/1/0434/6701/4297/files/datixenumulodagosadewo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6003/5735/files/73972430805.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_off00007ac0.bin
14a3b2fa61481536a87b11d2ec417ac3a4970955bf08b2b0c4a29fd179cf2b8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 5672 bytes
font_01_sfnt_off00008e0f.bin
a2429a6a0457cd5dcc1d5fcbfba8158ff25e8aa6f8c3c14bfa778170bf1ad8b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0F 10176 bytes