Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcd2da04090a722…

MALICIOUS

PDF

41.8 KB Created: 2020-08-16 11:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf6c32659bc71eb29d13662ce3170813 SHA-1: 381e5c4330d1c6ca832856d5e38e4c18e779d606 SHA-256: 9dcd2da04090a7225657bddbdd66efb4c6a2cf5a14bb0c961ffa38762b700844
152 Risk Score

Malware Insights

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

The PDF contains a deceptive link disguised as a "carproof report free" which redirects to malicious infrastructure at ttraff.ru. The sample also hosts a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicated maliciousness.

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=carproof+report+free
    • http://files.genyablake.com/uploads/1/3/1/4/131407655/zoxovitimut.pdf
    • http://files.driftset.net/uploads/1/3/1/4/131408117/laludumezeluxavatuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/51892523904.pdf
    • https://cdn.shopify.com/s/files/1/0440/3340/9174/files/82374651504.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5987/files/70563541417.pdf
    • https://cdn.shopify.com/s/files/1/0440/6057/3846/files/aiag_core_tools_manuals.pdf
    • https://cdn.shopify.com/s/files/1/0437/8286/5047/files/cancer_de_mama_minsa.pdf
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/37314228938.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/kinazatolunom.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/human_body_systems_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/99432714081.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_off000065ae.bin
68b5518922d511878b5b26548978c6388197207f1a43fe3ebebca0c23f6aac3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65AE 4588 bytes
font_01_sfnt_off0000755a.bin
297aa5772bc591e8a7d27beed4228392879ec850652e4a707c6beaa79b767bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755A 11216 bytes

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