Malicious PDF — malware analysis report

Static analysis result for SHA-256 237f468a33f0629a…

MALICIOUS

PDF

34.0 KB Created: 2020-08-03 09:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16116e1d1d34981d722eeaa852362d5d SHA-1: fd6e6b582aa85e32a6921511f423ad1dc0910071 SHA-256: 237f468a33f0629a28d0ce638c4778a64e84117fcefe44e67791ed337c6f022f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious component. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=reverse+linked+list+leetcode
    • http://files.pitbullleatherwork.com/uploads/1/3/0/9/130969446/vowutasivuwo-famat-rotuvusi-fifosukuxabixev.pdf
    • http://files.psychocare.org/uploads/1/3/0/8/130814245/xatogaguzana.pdf
    • http://files.turtlerecording.com/uploads/1/3/1/4/131437953/zalekosaz.pdf
    • http://files.womensclinicatlantaabortion.com/uploads/1/3/1/3/131382141/9237162.pdf
    • http://files.voidprove.com/uploads/1/3/0/7/130775228/1414904.pdf
    • https://cdn.shopify.com/s/files/1/0441/2299/6888/files/96475317378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30547733638.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/22976411256.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/body_beast_diet_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8473/2829/files/10482018316.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6554/files/xomatinawuwetukuful.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/fairy_tail_episodes_list.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/32054867176.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/mifotijibabop.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/33218842018.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_off000048b3.bin
a1241dc16132e3944f72328529334e869985bb28640d575a885d3b73fa683af0
pdf-font-stream PDF embedded font (sfnt) at offset 0x48B3 4852 bytes
font_01_sfnt_off00005951.bin
3be7fc09024a3aacc19118341314d106bd7971ad723ca556a333c6d4a9930388
pdf-font-stream PDF embedded font (sfnt) at offset 0x5951 9928 bytes