Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f31baaa26fa1b1b…

MALICIOUS

PDF

36.7 KB Created: 2020-08-14 23:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 694261ecd358e48e8dfcbb8d2f3e25b1 SHA-1: 3908ae9e76a6b8994e117e203fdc6e33fa9eac90 SHA-256: 4f31baaa26fa1b1bce22b69550a3fbef8cacd932ae3e034b333e01adedda28d8
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the primary purpose is to lure users to external, potentially malicious, sites. The document body itself is heavily obfuscated and contains a mix of text and URLs, reinforcing the link-based attack vector.

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=narasimha+audio+songs
    • http://files.ifoodtz.com/uploads/1/3/1/4/131453316/zilavine_negizejufuvi_viboxovem_gikapuwesu.pdf
    • http://files.wfhsbigred.com/uploads/1/3/0/8/130814085/f90f7589ce77f.pdf
    • https://cdn.shopify.com/s/files/1/0437/9761/0657/files/20957755958.pdf
    • https://cdn.shopify.com/s/files/1/0434/8457/7956/files/29982057602.pdf
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/pdf_bestand_kleiner_maken_om_te_mailen.pdf
    • https://cdn.shopify.com/s/files/1/0430/9785/0017/files/gewabidetetosolalaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/wisobelexuvipuperuxikase.pdf
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/jaguwuruvotuxoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/72454992789.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/befalepodujefikixipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/43065075607.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004611.bin
54ffc94cf8f10444f5344e8960b1d9e86a28ae5dfad2e0da4e6867b61ad0c7c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4611 4860 bytes
font_01_sfnt_off0000565b.bin
c3fc1a6b553c199949c69cc822714a32e42a7614e042e8cdd3bfbb129f13d8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x565B 9864 bytes
font_02_sfnt_off0000781c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781C 4324 bytes

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