Malicious PDF — malware analysis report

Static analysis result for SHA-256 171b044e7470869a…

MALICIOUS

PDF

71.0 KB Created: 2021-01-18 18:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 422f9de1bbd0f0cbc4947c71c5bcc223 SHA-1: eff3e4ff04fe6a3775aee0cd54599a567f0bd382 SHA-256: 171b044e7470869adbdf1b3f4f4e100c85e7612893be4b9dcd26b9ffcf134562
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded links, particularly to 'gettraff.ru', suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 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=rtog+contouring+guidelines In PDF document text
    • https://site-1166670.mozfiles.com/files/1166670/28729251228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fc148532b084.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/9aWRoPX/blitz_brigade_online_fps_guns.pdfIn PDF document text
    • https://site-1177585.mozfiles.com/files/1177585/68944495033.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388289/normal_5f99173cdc058.pdfIn PDF document text
    • https://tudidufagul.weebly.com/uploads/1/3/4/6/134622529/xonake.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465263/normal_5ff890e87a44d.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/xalasawu/fivelipipinuz.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/divinity_original_sin_2_romance_guide.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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 4904 bytes
SHA-256: b053329be6c10c9f122d7f6f8f28331daf821dcf23a83e2b5069ffe90b741667
font_01_sfnt_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10480 bytes
SHA-256: 178b7081f59520a1f67bacedb87919ecc3103c99e321e233c95f5fad33f8f752

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