Malicious PDF — malware analysis report

Static analysis result for SHA-256 51902abd8f2d8de7…

MALICIOUS

PDF

69.3 KB Created: 2021-01-12 01:05:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f123792401895f2b29c796c08ddfd7d2 SHA-1: 9122c734a1a3a5fad61d5a924a7c233023897d77 SHA-256: 51902abd8f2d8de705672c2bcca35f10f62ef4df96dae3cb01ad10dd5615c01f
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by multiple heuristics, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URL, 'https://ggtraff.ru/aws?utm_term=free+printable+worksheets+for+preschoolers', is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=free+printable+worksheets+for+preschoolers
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5fde4e17ba04d.pdf
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fa5037c10b2d.pdf
    • https://static.s123-cdn-static.com/uploads/4420608/normal_5ff8b4db2cd30.pdf
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fe2da03413e8.pdf
    • https://cdn-cms.f-static.net/uploads/4454684/normal_5fd2411caf1b7.pdf
    • https://cdn-cms.f-static.net/uploads/4453718/normal_5fb76d5b9b08e.pdf
    • https://site-1176856.mozfiles.com/files/1176856/jakesimobarawewunorojisa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pegek/kewegojotifozafataz.pdf
    • https://s3.amazonaws.com/belapawerezuju/madababegizo.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/14199796425.pdf
    • https://s3.amazonaws.com/nazekisigiduz/yahoo_mail_free_for_ipad.pdf
    • https://s3.amazonaws.com/xefezesebusu/banjo_kazooie_spiral_mountain_piano_sheet_music.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_off0000d1cf.bin
fcffb422563d1d88f64238dcf200606752450ff46e8748f73c6e2469324ba38e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 5352 bytes
font_01_sfnt_off0000e415.bin
68549fe8c323161d86f32fe960e253794d962915791951f61548506e92c3fb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 10520 bytes

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