Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ecc1244dc49e13…

MALICIOUS

PDF

61.9 KB Created: 2020-11-22 10:37:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a281633a1a7fecc86e4d7a279f559cc5 SHA-1: 7ab3058db42bf8ffb54f30c430100ac26679b7cf SHA-256: a0ecc1244dc49e13b4da32911c5cec0417430faa5fc43df1a09e540a3c24e9bf
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ggtraff.ru'. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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?utm_term=air+systems+international+breather+box+manual In PDF document text
    • https://wokusozevopiwaj.weebly.com/uploads/1/3/4/3/134381386/musujub_gazuzutafan_sikelenota.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/lifak.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/9021126.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496584/normal_5fb9c4742509b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_5fb7747ae6c08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412378/normal_5f962435caab3.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/jepavilutabilel/calorimetry_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/brother_xr_65_manual_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/angelina_jolie_how_many_kids_adopted.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/descriptive_essay_formats.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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 5224 bytes
SHA-256: 4095040133dfc49d9cf9be52afd44bee29a9331481716079967e2fa46aecd5f3
font_01_sfnt_off0000c584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 10416 bytes
SHA-256: ac769d4ff7166552ed5699eecc27e5b1dcd0f667a39eaa77f918b3642a0ddf2d

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