Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33721887ba9e0fb…

MALICIOUS

PDF

60.5 KB Created: 2020-12-18 00:06:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fd2aaa21408072fcfaf766c42868060 SHA-1: 7a16fc29b97b6123c7b6343fa1f4ee67f49890d3 SHA-256: a33721887ba9e0fb50186879bdb2042539347dbfe735c0d53cdf2dca20fbade8
214 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying a link to known malicious redirector infrastructure at 'ggtraff.ru'. Another critical heuristic indicates a PDF link farm, suggesting an attempt to generate traffic or distribute content through a large number of external links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=houghton+mifflin+harcourt+publishing+company+answer+key+grade+7
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fb973d3e7c52.pdf
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f9377b8757e9.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fa5f55f94de7.pdf
    • https://fuxobubexozemag.weebly.com/uploads/1/3/4/7/134752644/3786353.pdf
    • https://cdn-cms.f-static.net/uploads/4384468/normal_5fa08f45cdc7d.pdf
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/wovif.pdf
    • https://cdn-cms.f-static.net/uploads/4416331/normal_5f993c8a57fd2.pdf
    • https://fupexojor.weebly.com/uploads/1/3/4/0/134017307/nusefitenuvenajakij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bivanud/shipwrecks_lembongan_surf_report.pdf
    • https://static1.squarespace.com/static/5fc11cf00a2757459be424fe/t/5fc3a58d9b1ed035384cb244/1606657421468/pakezigafudabiluferalarek.pdf
    • https://s3.amazonaws.com/zetare/69538671944.pdf
    • https://uploads.strikinglycdn.com/files/c8bb9b45-ba28-409c-836c-f733d136444c/66944325058.pdf
    • https://uploads.strikinglycdn.com/files/5afd3794-c7b8-4816-8d8c-446f8b79e62d/pokemon_platinum_version_ds.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac01.bin
12b1b313671bce32e6fdb55863401483bcd1ba7e65bce5bf7b510ee45d269305		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC01 6008 bytes
font_01_sfnt_off0000c05e.bin
24cf10b324cd8e3ee80bf91e828e48cfe6b509f0c5831c0e736b5667cd7973d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC05E 10716 bytes

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