Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17b62d046071318…

MALICIOUS

PDF

86.4 KB Created: 2021-01-18 17:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8588734885abba48de777003dd9b80c2 SHA-1: 75ce269e9829fc974df9c4f4bf631e1b3686dc51 SHA-256: f17b62d04607131893078f6dcd019269093909225fc2efda09302c7af73438ab
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector and a link farm. It contains numerous embedded URLs pointing to disposable hosting and potentially malicious redirectors, such as 'https://cctraff.ru/123?utm_term=stickman+rpg+complete'. The primary function appears to be directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/123?utm_term=stickman+rpg+complete In PDF document text
    • https://cdn.sqhk.co/bizufunido/esiaqhe/46823895711.pdfIn PDF document text
    • https://wigikeketiru.weebly.com/uploads/1/3/1/4/131406435/gujop.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/jixonikokiparo.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/5q27YVl/smartwool_merino_250_women_s.pdfIn PDF document text
    • https://site-1174534.mozfiles.com/files/1174534/daxapereviraluvute.pdfIn PDF document text
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/1376160.pdfIn PDF document text
    • https://site-1083772.mozfiles.com/files/1083772/unified_offline_loading.pdfIn PDF document text
    • https://cdn.sqhk.co/wireriduwude/jjUja3l/neutralizer_for_hair.pdfIn PDF document text
    • https://cdn.sqhk.co/sirazisiluz/gibia4I/polar_roller_reviews.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasexojubil.epizy.com/79027089165.pdfIn PDF document text
    • http://renureva.epizy.com/glioblastoma_multiforme_5_year_survival.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/myocardial_revascularization_guidelines_2018_pubmed.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_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 5244 bytes
SHA-256: b30a9fe0da19ce2c2ee6e230fe1f0b455f24ed2e3fce517264c2353a32d7cd20
font_01_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 11404 bytes
SHA-256: 0d73bf2881256ad9763b1f5f0375ca15f533da308887d96f2a6787421cbd8097

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