Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e7621a718b6bd2e…

MALICIOUS

PDF

38.5 KB Created: 2020-08-02 23:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abf1e5d7358f99c1cc49d0f8ca123986 SHA-1: 70247c792dd48172b57c54abbd7f105976e73a5e SHA-256: 8e7621a718b6bd2efaaf14a207fb55f714da87dd2bd955619d910dd4ed6707b2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with a primary malicious redirector URL. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, reinforcing the link farm tactic. This suggests a campaign leveraging SEO poisoning or similar techniques to drive traffic to malicious infrastructure.

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=zydrate+anatomy+lyrics
    • http://files.thermocoustics.com/uploads/1/3/1/4/131438439/nawiwelapororif.pdf
    • http://files.achieversmindset.org/uploads/1/3/1/3/131381078/funuzexomigolaxag.pdf
    • http://files.susecchaletandwinery.com/uploads/1/3/0/7/130738823/dfb72b473.pdf
    • http://files.paulheroux.org/uploads/1/3/1/4/131410007/4597128.pdf
    • http://files.chicagobrickpaving.com/uploads/1/3/1/6/131636642/wasabukudenupafapas.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/14908666535.pdf
    • https://cdn.shopify.com/s/files/1/0439/9818/3582/files/25282573445.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/foreminu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/55710426197.pdf
    • https://cdn.shopify.com/s/files/1/0441/4259/2152/files/deguzediperesuwijejagok.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1485/files/13851591347.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/54758152728.pdf
    • https://cdn.shopify.com/s/files/1/0435/5719/1843/files/pumed.pdf
    • https://cdn.shopify.com/s/files/1/0433/3387/7914/files/19314958142.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/newupipowuwakolisupepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/thomas_guide_los_angeles.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_off000055bb.bin
4f2be9c50847dc1883199e1c85bf41ac65fd4ca9aec52b8b38f91d1b8e32929c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55BB 5144 bytes
font_01_sfnt_off0000672b.bin
7ce4ccdde74e97992b1ea46e328a5d38c4e8e27986894125708e6018f5be7965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672B 11792 bytes

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