Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04f55e9e9dbfd50…

MALICIOUS

PDF

41.1 KB Created: 2020-08-03 11:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae572ea165be173a9af8acfc1852a2c9 SHA-1: d8bb4fa0ef466e9fdd8865a718f2eff713215d71 SHA-256: d04f55e9e9dbfd50bb11b72db4cd3afabdf84c3229147afa8b7fea170710e9bb
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to external PDF files, likely for SEO manipulation or to obscure malicious intent. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content.

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=estimulacion+del+nervio+vago+pdf
    • http://files.thefrostedcookiery.net/uploads/1/3/0/9/130969683/rumovipupaxen.pdf
    • http://files.mckinneyinternational.org/uploads/1/3/2/7/132740498/fevutawip.pdf
    • http://files.writingdayworkshops.com/uploads/1/3/1/3/131398336/5697373.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/xemukavesajavavelulatim.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/kusiwawubarejigewunora.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/stainless_steel_6._3.pdf
    • https://cdn.shopify.com/s/files/1/0433/3463/1579/files/mojekemibenan.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/nesazusegetusitunam.pdf
    • https://cdn.shopify.com/s/files/1/0428/1293/2255/files/wafoxunivuru.pdf
    • https://cdn.shopify.com/s/files/1/0428/5782/4419/files/51889848861.pdf
    • https://cdn.shopify.com/s/files/1/0428/7194/7423/files/9328534067.pdf
    • https://cdn.shopify.com/s/files/1/0432/0113/4754/files/25295944893.pdf
    • https://cdn.shopify.com/s/files/1/0437/9394/0629/files/jojumonumibutevulet.pdf
    • https://cdn.shopify.com/s/files/1/0429/6392/7203/files/voxunewuwimoliz.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_off0000605f.bin
fcc7c3e2abd527573b58567c0abab2d200b46f8646c4f63a8b8d94345965bf23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x605F 5492 bytes
font_01_sfnt_off00007305.bin
bcfa8397ffbd2732f890f5bb4a5a3fc7a496ceb072102f2bbee4f469087d77e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7305 10768 bytes

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