Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c00d26203e902b…

MALICIOUS

PDF

40.6 KB Created: 2020-10-11 03:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e02ea3eeb1e79aa35d2e7ffaa75dcc7 SHA-1: d4bd84a6ea9aab77ebdf2ccc2a00b1123d2ed857 SHA-256: 57c00d26203e902bf9f3bfa2bee7a8cc5bddfdc7648bb80d62d0458e1cf5fd47
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm. One URL, 'https://gettraff.ru/pify?keyword=clark+creative+education', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document's purpose appears to be SEO manipulation or distributing further malicious content through these links.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/pify?keyword=clark+creative+education In PDF document text
    • https://site-1036830.mozfiles.com/files/1036830/15924027748.pdfIn PDF document text
    • https://site-1037858.mozfiles.com/files/1037858/80484950601.pdfIn PDF document text
    • https://site-1043965.mozfiles.com/files/1043965/vejuxurimokebavomitumof.pdfIn PDF document text
    • https://site-1039666.mozfiles.com/files/1039666/70253826940.pdfIn PDF document text
    • https://site-1040612.mozfiles.com/files/1040612/27808672492.pdfIn PDF document text
    • http://files.saviainhomecounseling.org/uploads/1/3/1/8/131856247/ede2c4540c2.pdfIn PDF document text
    • https://site-1043837.mozfiles.com/files/1043837/zotukigumemokimekenil.pdfIn PDF document text
    • https://site-1045368.mozfiles.com/files/1045368/midegojarowurixojogute.pdfIn PDF document text
    • https://site-1039578.mozfiles.com/files/1039578/13267327135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33c77cbe-5771-4290-84d4-c80103d526de/2514218963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc903c62-fd7e-4f84-a94e-9e55795ff0b8/54983211973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34addbe8-5f45-406d-9b7b-ca498fb422db/93447629563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fdbd837-28da-4c1d-838b-bc23318b1e35/wujafulirufafebuw.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_off0000626f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626F 4784 bytes
SHA-256: ed6db7d0f186bb90653329c533ecb9461624695f937c1b30f1cce2ce93ac1ff4
font_01_sfnt_off000072c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72C1 10260 bytes
SHA-256: 9a172f851922e82ea43708cfb318f43d4c2ba3c676c6396125a8f0fde6378907

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