Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc8c19cc46242bd…

MALICIOUS

PDF

70.9 KB Created: 2020-08-14 15:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e25377668fbceb86e0e7f95a5bf4fb20 SHA-1: c6bee066416cef03846d92a91525c21e148314a9 SHA-256: 9bc8c19cc46242bd67ba9aae94479cd39c585448707d75950b43623b1e7f084a
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to its inclusion of a link farm and a redirector to known malicious infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=drug+metabolism+book+pdf. While the document body contains garbled text, the heuristics strongly indicate a malicious redirection attempt. No scripts were extracted, limiting further analysis of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=drug+metabolism+book+pdf
    • http://ziriwe.swflaletrail.com/uploads/1/3/1/3/131383664/tasufenu_rovuzasimaseju_xigewitamaxoxon.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6086/files/52761533815.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/zesego.pdf
    • https://cdn.shopify.com/s/files/1/0437/1995/0485/files/bawebowinebubudutojuk.pdf
    • https://cdn.shopify.com/s/files/1/0438/1740/2530/files/girigasurifokove.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8395/files/97426996355.pdf
    • https://cdn.shopify.com/s/files/1/0432/5156/4707/files/rusurunuduvosexat.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pesaveput.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9760/files/ielts_academic_reading_samples_with_answers.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_off0000d8ab.bin
d473c3ed2e84aaaae059bd4f10b18be312e57ce8782bd8232fcff0d238d8f8b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 5564 bytes
font_01_sfnt_off0000eb7b.bin
a3b6c6b4f6ebfec4f8219747e9cfe735443cbd08de1c620002d4adeba4aefe30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 10388 bytes

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