Malicious PDF — malware analysis report

Static analysis result for SHA-256 c865d84e82a411ff…

MALICIOUS

PDF

43.6 KB Created: 2020-11-08 12:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9a5f8825ca3119d124d2ad05d2e03ef6 SHA-1: dd41f7bf86fe6ef9ba44a35e6305ad5f20854d64 SHA-256: c865d84e82a411ff9c3b3204edd1032bf410b90219e97d0fd5df846c6ae71bcc
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Cingular wireless contact' and urgency lures, suggesting a phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ggtraff.ru/aws?keyword=cingular+wireless+contact In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366365/normal_5f870f3bc053d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5f95f56281afe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379846/normal_5f9938d791003.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/fuwuzesobizixegatuje.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/nokamikux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f98b13b622c7.pdfIn PDF document text
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/kilokuwamoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_5fa49a0ecd4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f88d3900bfcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f873977db524.pdfIn PDF document text
    • https://wikazire.weebly.com/uploads/1/3/0/9/130968935/f516e6166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5f9019b26ace4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupuso/kupum.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/85746700913.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/rajuwasokidosenoguzipu.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/85799289136.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/summary_of_a_chip_of_glass_ruby.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C15 4964 bytes
SHA-256: da588135e1f4d8b924d4169b3b0fdddf39f41b32165649e3da17495def353bfb
font_01_sfnt_off00007d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1C 10596 bytes
SHA-256: 6c230b8ead90b0749c675515bcd9a652ddf9e505bf409d142bfd9e021a24f8e9

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