Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7b49b63350fd4d…

MALICIOUS

PDF

52.0 KB Created: 2020-08-30 17:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89b3aa60bfb746aaa63f13bde4f4ac1 SHA-1: 677f7688b7fdea5306d4833fb81d7944ee3b7c8b SHA-256: 9d7b49b63350fd4da405e0f6597ee5306b427493f79eb5717aa07aca69484df5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely part of a link farm or SEO manipulation scheme. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain embedded URLs, further supporting the malicious redirector finding. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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/wix?keyword=technics+sl-+d30
    • https://static.usrfiles.com/ugd/fb83f1_cb31cc4922b54f5ab5db45d7b5428bc2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9979734c352b4e92a8f1826d6c7d9f22.pdf
    • https://static.usrfiles.com/ugd/32777b_287c5a04de334c38865becc84b8d2d28.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7206/files/dime_quien_te_entiende.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/jeep_cherokee_2017_maintenance_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/wuvitabujapukajavowomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9667/0365/files/kenmore_sewing_machine_model_5186_ma.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/professor_messer_network_notes_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6058/4870/files/71380166965.pdf
    • https://cdn.shopify.com/s/files/1/0427/5775/0951/files/48963581473.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_off00008dff.bin
99c6a062952d3544c8f35c1327d21aee83beda6763ca488631f167f1fa94a79e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DFF 5008 bytes
font_01_sfnt_off00009f06.bin
e12fbc09cdb92dcc15ea6c0930b0c2742f6dd6601eaab15db5a39b077f7a3fa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F06 10872 bytes

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