Malicious PDF — malware analysis report

Static analysis result for SHA-256 c254c93a1cf7c62a…

MALICIOUS

PDF

35.3 KB Created: 2020-08-23 22:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be4c3b93b27caa53534a6b87e1c639f7 SHA-1: 9f84f6cf1ef9490f8f1f796936706ec62d6d6a4e SHA-256: c254c93a1cf7c62afd84ef90e4714922435dcceefa7f74618bb8c51edbf8cd53
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting an SEO link farm or a distribution point for malicious content. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which in turn links to a PDF hosted on Shopify. The presence of numerous links to PDFs on various domains, many of which are dynamically generated, indicates a campaign focused on link manipulation.

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=butterfly+on+a+wheel+english+subtitles
    • http://files.yasense-excel-opc-live-data.com/uploads/1/3/2/6/132681080/2970244.pdf
    • http://files.djbendigo.com/uploads/1/3/0/8/130873718/lojin-morowemijuwakef-dekunase-mewapavuj.pdf
    • http://files.english.dollessence.com/uploads/1/3/1/4/131453623/9895293.pdf
    • http://files.rethinkreframerelax.com/uploads/1/3/0/7/130739027/vomume.pdf
    • http://files.emmazenfoundation.org/uploads/1/3/0/8/130873921/8265662.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/fopopawodepazujug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/73930597884.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/tb12_nutrition_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2608/7064/files/bosch_dishwasher_sms63l02ea_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3784/files/31609875771.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/72248918103.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8364/files/tacoma_traffic_cameras.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51268900441.pdf
    • https://cdn.shopify.com/s/files/1/0434/9077/1110/files/kautilya_arthashastra_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/rugojigilegiwoli.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5312/files/dajuzix.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/kituzopopupawawudakeze.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_off00004b3e.bin
e52c3867b10a3cce8422f46300470ff22d3ca3e8d194ca2a41c4e481960c28eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3E 5412 bytes
font_01_sfnt_off00005dbd.bin
cd5132f92dc0275513d79feb06ceb4d632e6d5835880440e0e72105a66cd928a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBD 10116 bytes