Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2bfb642fd65f7ac…

MALICIOUS

PDF

38.4 KB Created: 2020-08-01 16:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd79f76f06d2671b299d8c556b176ee3 SHA-1: d798fe016d3405ee32877b3b800cfc1b9a928bed SHA-256: a2bfb642fd65f7ac3206fc0fb708871a38bf0932797e6000acb2dec1df459331
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a PDF link to a known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=love+dont+change'. Another critical heuristic indicated the presence of a PDF link farm, with many links pointing to Shopify domains, likely as a means to distribute malicious content or obscure the true origin. The document body itself is heavily obfuscated and contains the same redirector URL and a large number of Shopify URLs, reinforcing the link farm and redirector findings.

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=love+dont+change
    • http://files.editionalicesutton.com/uploads/1/3/2/7/132741430/gesukevami_siwolasuzumavu_welosowukabara.pdf
    • http://files.oksirconnect.com/uploads/1/3/2/6/132695836/7137915.pdf
    • http://files.papershadestudio.com/uploads/1/3/1/4/131453725/9d4018.pdf
    • http://files.lotusmoda.org/uploads/1/3/0/7/130776033/6386069.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/fikevepabokaguba.pdf
    • https://cdn.shopify.com/s/files/1/0431/6754/7552/files/63698726338.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/76076328804.pdf
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/gejemekekugunudupolodemup.pdf
    • https://cdn.shopify.com/s/files/1/0429/6795/7658/files/sulotitaxavemiwugem.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4882/files/28661973338.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/49427718224.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5352/files/gilowewofuno.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/forukunupugunugiwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/merenilavutora.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/dudopamobizojezagegib.pdf
    • https://cdn.shopify.com/s/files/1/0433/5783/1336/files/39416316251.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_off00005a4a.bin
3b04093989f72a83177154aa744f57b3a04818cdcd359330e3c25418c8257405		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4A 4896 bytes
font_01_sfnt_off00006aff.bin
72388b932b481becbca91f70efe474d7f34bb6e72876a1ea0d5dfb55cabeba92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFF 9948 bytes

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