Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ad19d808c4daa6…

MALICIOUS

PDF

43.4 KB Created: 2020-08-23 21:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5af635719cc5eb34cb9a6d34b35acf9 SHA-1: 91e017b5559bfffc5da48d680a5ca5240607dfe7 SHA-256: 79ad19d808c4daa6ce4aa902ade8b0eb3b8d7ed0ede4c09ca475f3a01715bf82
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, https://ttraff.ru/pify?keyword=communication+skills+presentation+pdf, which is designed to lure users into clicking it under the guise of a presentation. The document also hosts a large number of external PDF links, many of which point to benign Shopify URLs, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=communication+skills+presentation+pdf
    • http://files.rekindletheflame.org/uploads/1/3/1/3/131379049/nodenowozokef-nonabab-wulojebapitovek.pdf
    • http://files.partnersdrivingstem.org/uploads/1/3/2/6/132681199/nurasinuz.pdf
    • http://kubazumal.discerningheartsministry.net/uploads/1/3/0/8/130814328/fawokuto_nefisudejilum.pdf
    • http://files.wateam.net/uploads/1/3/1/3/131398252/0ba78270d9.pdf
    • https://cdn.shopify.com/s/files/1/0432/8187/5104/files/41703102824.pdf
    • https://cdn.shopify.com/s/files/1/0435/0060/1504/files/57562272539.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/90212766089.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3590/files/lusuxelurafifop.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/13855904187.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/11785163078.pdf
    • https://cdn.shopify.com/s/files/1/0447/2268/4058/files/adobe_photoshop_tutorials_in_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0448/4051/7793/files/94940688445.pdf
    • https://cdn.shopify.com/s/files/1/0431/3776/1437/files/minecraft_1._6._4_mods.pdf
    • https://cdn.shopify.com/s/files/1/0430/6668/7642/files/pmbok_6_agile.pdf
    • https://cdn.shopify.com/s/files/1/0430/4994/3202/files/11792188889.pdf
    • https://cdn.shopify.com/s/files/1/0449/3508/6248/files/gevobuzilaburavazaruro.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_off00006c40.bin
3f7ffa5b522b4bc096384acacbd779117b5655781d929453cad5be50d75bd430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C40 5268 bytes
font_01_sfnt_off00007e12.bin
d4978c17de2c38c541560912be57543346820b81050d46c7d1c7b1f377c7e4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E12 10024 bytes

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