Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca25b19a06cf49d2…

MALICIOUS

PDF

35.8 KB Created: 2020-09-18 13:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03e36dc99b46ab731ca68a2620d9e3c7 SHA-1: b51ae68befb6937aed43031b0edb23aa3ab23c82 SHA-256: ca25b19a06cf49d2bbcbe79a01d9a9edbb410a934d2c0df469946798a8f1228e
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised with a game-related keyword. It also features a large number of links to other PDFs hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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.me/wix?keyword=death+run+3d+y8
    • http://dupidi.poofdirtfarming.com/uploads/1/3/1/4/131406687/c2aa953.pdf
    • http://files.oliviawoolf.com/uploads/1/3/1/4/131407572/8964719.pdf
    • http://files.xingyibo.com/uploads/1/3/1/0/131071114/f1c7fb288fff4cd.pdf
    • http://rizagi.cn.lglministry.org/uploads/1/3/0/8/130813612/tegerud.pdf
    • http://sadep.khaoyaiandbeyond.com/uploads/1/3/0/9/130969204/1955b.pdf
    • http://zavobobo.2018vote.us/uploads/1/3/1/4/131410227/xomaxilam_sirozorodox_medowozubedes_pisulipomufefu.pdf
    • http://dafeko.madxllc.com/uploads/1/3/0/8/130874254/20e315dad34152.pdf
    • http://nepafe.amdlifestylemgt.com/uploads/1/3/0/7/130775374/6cadcf0c9f.pdf
    • http://files.aorerepathways.com/uploads/1/3/0/7/130739140/lijokajo_vamaregusem_tivexufi.pdf
    • https://22718d98-2d2c-4828-b0f0-0fd1887ec2a2.filesusr.com/ugd/f08e01_b4a35b42a3b44146aa1258568acb34ca.pdf?index=true
    • https://3bec6408-218d-4413-b4cd-98e29560b594.filesusr.com/ugd/1b9faa_21a74790bab2415184cca9e176bdfb60.pdf?index=true
    • https://208c455d-93e3-44df-8759-c1b8f29eff97.filesusr.com/ugd/0251f0_e8f66f629f4440e5984cdcfeec09d056.pdf?index=true
    • https://9c467621-83fe-4b13-959d-d50ce1c1a9bd.filesusr.com/ugd/a01749_8f79df347fe6461983dc8a9f9fdb91b8.pdf?index=true
    • https://92e6a323-8aca-4102-8b72-f6f836b9ea26.filesusr.com/ugd/7a359d_223854231b82447fa281f69a4bbc8f4c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/gemivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8402/files/army_risk_assessment_form_number.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_off00004d90.bin
2d622101c64c119829fbaaad7b9e0d7ad72d2a5fa1c87abbf5e5aba2a54a04c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D90 5160 bytes
font_01_sfnt_off00005f24.bin
a59bdf7b7364a15637d8f7d196e89f56e5aa688eff5eb170b2dec3b7957a2389
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F24 10444 bytes