Malicious PDF — malware analysis report

Static analysis result for SHA-256 4398c1544e39dc1a…

MALICIOUS

PDF

40.5 KB Created: 2020-08-14 03:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a24e9c481cdfbebcc009673c22e8a561 SHA-1: b3afae30ad73527dc2dd16ae06d242fd4faaf9e8 SHA-256: 4398c1544e39dc1a3b2f7e1b8d45c0cbc0da781af41f49908cc85bd718f0ea11
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, likely for SEO poisoning. One critical heuristic identified a malicious redirector link pointing to 'ttraff.com', disguised as an academic worksheet answer key. This suggests the primary goal is to redirect users to malicious infrastructure. No scripts were extracted from this sample.

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.com/pify?keyword=independent+events+worksheet+1+answer+key
    • http://bamigo.retrieversofmillbach.com/uploads/1/3/0/8/130813784/4359ec671.pdf
    • http://files.madeintombstone.com/uploads/1/3/1/1/131163969/fuzefibegepago-goxos-ranal-rugimexade.pdf
    • http://files.straystreetstnr.com/uploads/1/3/2/3/132302970/doribukoz.pdf
    • http://files.larrondolab.com/uploads/1/3/0/7/130740618/reviri_xemabeji.pdf
    • http://files.tworiversrecovery.com/uploads/1/3/2/7/132740860/91cf8adff.pdf
    • https://cdn.shopify.com/s/files/1/0447/4103/4135/files/penicillin_biosynthesis.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/bosch_invented_for_life.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/41956981321.pdf
    • https://cdn.shopify.com/s/files/1/0435/8848/5288/files/fire_emblem_the_binding_blade_rom.pdf
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/winowasarexumafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/tamavelab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.pdf
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/kamagifis.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/65542377753.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/tijuvoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/54358667389.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/wugitulimagupetajufure.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_off00005d8b.bin
4e7f940b1bef67a7c4226d78f58aff87c6c991c828717943978f6bb01e731daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8B 5320 bytes
font_01_sfnt_off00006fb8.bin
523e99676d5420dd9ae15fac5370a514f6230bc6103f1ce3587954826aceb9a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 11340 bytes

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