Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c170e9e860f4906…

MALICIOUS

PDF

34.1 KB Created: 2020-08-04 11:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5616fd7f13f2c6c2f04480201868123 SHA-1: 40185b709ce2274b385dc35ad2da8e404fcc493d SHA-256: 1c170e9e860f4906e932752408fe2dcf0d456c317539f02f7db5cf7d201f3fe9
128 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a known malicious domain, disguised as a download for an English to Gujarati dictionary. The PDF also features a mass external link farm, indicating a SEO poisoning or link farm tactic. The presence of a 'download button' heuristic further supports the lure. The primary malicious IOC is the redirector URL.

Heuristics 4

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=english+to+gujarati+dictionary+free+download+for+pc+pdf
    • http://files.mattnelsonreviews.com/uploads/1/3/1/6/131636843/53e8b.pdf
    • http://files.grpwoodworks.com/uploads/1/3/1/3/131398504/xojumujaxuponetab.pdf
    • http://files.gabisorrentino.com/uploads/1/3/1/4/131409170/d0e06c01.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/55148813341.pdf
    • https://cdn.shopify.com/s/files/1/0431/7236/4437/files/rumaviwupeziwenugamibu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1274/3580/files/sejogelifowas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/lamopirigaxoko.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/burial_rites_quotes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/gujos.pdf
    • https://cdn.shopify.com/s/files/1/0430/5548/0981/files/2682270322.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5564/files/31170314642.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/vujelalifuzaxexovixag.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/san_bernardino_food_handlers.pdf
    • https://cdn.shopify.com/s/files/1/0433/8581/5205/files/tidotizukevamikezoki.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/tukirigi.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_off0000484c.bin
c0889e205cdb6adfde5bdccb1bfbe180e3c842b21c4cdc6de55310360c710914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x484C 5644 bytes
font_01_sfnt_off00005b9f.bin
485270c4fe449b1492dae876d3c871bd01ecee948c2a831f8926eebec3e9997e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9F 9232 bytes

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