Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc100906de55a7a…

MALICIOUS

PDF

44.9 KB Created: 2020-08-26 23:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05f12919240032d8c035b9ac910d491c SHA-1: 038fed01020a999d06f4aae01e7f865b748eb3aa SHA-256: cfc100906de55a7a037d5ba4878e888059fda7019c6311fa45589278970d8352
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The embedded URL points to a known malicious redirector, which likely serves as the initial stage for delivering a payload. The document body contains garbled text but does include the malicious URL, reinforcing the findings.

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.cc/pify?keyword=barbarians+of+lemuria
    • http://fapefe.warmanddryuk.com/uploads/1/3/1/4/131453358/3598969.pdf
    • http://files.aweonline.com/uploads/1/3/0/8/130814682/e0a312.pdf
    • http://files.420radio.ca/uploads/1/3/1/4/131437117/dekeb_ridunewetezusi_mamasekef_bedoxejesoba.pdf
    • https://cdn.shopify.com/s/files/1/0449/4455/6187/files/sirugolukewemimeg.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/38501609672.pdf
    • https://cdn.shopify.com/s/files/1/0436/8800/1689/files/20895640602.pdf
    • https://cdn.shopify.com/s/files/1/0458/9643/3818/files/ucl_connected_curriculum_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0203/5352/files/can_you_put_a_gif_in.pdf
    • https://cdn.shopify.com/s/files/1/0457/3544/4646/files/4976002068.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/acls_pretest_answers_american_heart_association.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/moliwuzikipig.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7431/files/59527338250.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_off0000669f.bin
b264a4d420b1b4e8d8ba5df4e5d441b725b2dbfce47382d9665d57ebc73f7db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x669F 4904 bytes
font_01_sfnt_off00007727.bin
6562d489929a7718d3beae32c6e2ad26c5f564f19514c4cf3b3c59fe3f5ee22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7727 9948 bytes
font_02_sfnt_off0000992a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x992A 4324 bytes

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