Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc8c1ac2003d7c5…

MALICIOUS

PDF

44.8 KB Created: 2020-08-25 02:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97863e524380c3c1eeedb6add4a5955 SHA-1: 1054ac4f75eb33bb2b3fbfab30c6a43517865bfb SHA-256: 3bc8c1ac2003d7c53143f16e689bf4e68e89e1ad42ec856ae235db12286625b2
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic firing for a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body contains garbled text but includes the malicious redirector URL and several Shopify URLs, suggesting a lure or content hosting strategy.

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=short+story+in+english+audio
    • http://files.orientation.fis.hk/uploads/1/3/1/6/131637484/pekezovofedojozonaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/6539/3820/files/bias_fx_2_demo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1811/6510/files/jexidekurojupakejupinu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6168/files/cara_main_game_emulator_ps2_di_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/beretta_m9_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/jifurivez.pdf
    • https://cdn.shopify.com/s/files/1/0435/5561/8977/files/essential_ed-_e_and_rex_v1._0.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/96240188249.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/jusigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0950/7487/files/36727440728.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/35189949567.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_off00007204.bin
67e573b65907a77cafbaced01f04b885716bff4c6d1b8b69ed10f5d7a441f227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7204 5292 bytes
font_01_sfnt_off000083fa.bin
7b215a1b342ba5003f73e4e43e8bf71367aecf95e79c9726bae6474a3d6f035d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FA 10184 bytes

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