Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c052df4c8fb6eb…

MALICIOUS

PDF

68.2 KB Created: 2021-01-15 06:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: dc33eb080c8c675e2087210a86e7a1a0 SHA-1: 225b7e7582157cfb65c3998f72d4199c78911dd4 SHA-256: 70c052df4c8fb6eb1da3ab8f3c005e70963249240f29c2ddff440f435d127f8a
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link farm and a phishing attempt. The embedded URLs, such as 'https://gettraff.ru/aws?utm_term=spotify+apk+premium+2018', likely lead to malicious content or phishing sites. The document's structure and numerous external links suggest an attempt to manipulate search engine results or direct users to harmful destinations.

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://gettraff.ru/aws?utm_term=spotify+apk+premium+2018 In PDF document text
    • https://site-1248258.mozfiles.com/files/1248258/head_above_water_lyrics_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467286/normal_5fb2b1906828f.pdfIn PDF document text
    • https://site-1173778.mozfiles.com/files/1173778/forklift_certification_card_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_5fa255242c1d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5fba6ec418bdc.pdfIn PDF document text
    • https://site-1171112.mozfiles.com/files/1171112/smashed_potatoes_instant_pot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5f9a83bd798cb.pdfIn PDF document text
    • https://jagavovukivotu.weebly.com/uploads/1/3/4/8/134881855/4414844.pdfIn PDF document text
    • https://gidaxejopof.weebly.com/uploads/1/3/4/3/134305554/vovaxovob.pdfIn PDF document text
    • https://pubokimaxo.weebly.com/uploads/1/3/4/7/134710154/80594b8c0a.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/gumegulaxi/simple_debugging_questions_in_c_with_answers.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_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 5624 bytes
SHA-256: cc3e1d3c71ee318cd1b71bfa982c7cb67bd7e37372ba1eb811234be6be763055
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10796 bytes
SHA-256: 33435773cfbccda8efbb76751c338fe7a4dd8fc14a71b57dfa37e8b674c8a742

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