Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2937ab177f55c2…

MALICIOUS

PDF

65.9 KB Created: 2020-12-11 19:04:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64e4e9db8e5c197ce1635b42892d588d SHA-1: 1e9561e685ff888c5d472da6bbfaefa0d981de24 SHA-256: 4a2937ab177f55c25e77ff6f734819aa7ddbf965d4fb287f160603a19791554f
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One of the initial URLs, 'https://gettraff.ru/aws?utm_term=cover+letter+template+for+machinery+operator', is identified as a known malicious redirector. The file's structure and content suggest it is designed to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=cover+letter+template+for+machinery+operator
    • https://tufupuvakasu.weebly.com/uploads/1/3/4/3/134310035/vikipegixa_wudibofezudot_litipise_dilitamefizid.pdf
    • https://wojawafelufofux.weebly.com/uploads/1/3/0/8/130813934/bfe7f8886a4.pdf
    • https://wekonopu.weebly.com/uploads/1/3/4/8/134848362/vapafonoselakan.pdf
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/ec7828fbf02.pdf
    • https://cdn-cms.f-static.net/uploads/4413578/normal_5fd1df57018f0.pdf
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/40598f38.pdf
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/9fa10aa3c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc4c9c0abaecd33183b2183/t/5fcc3149eb18547f4b768804/1607217482049/baby_care_playpen_extra_panels.pdf
    • https://uploads.strikinglycdn.com/files/0e5b36fd-b088-42ba-ba10-0cca7c19087e/pepadiwijodozewerukiluz.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_off0000c707.bin
cfe54211325846701f9e62ca5abaa8f0725e64f44fc3e6459c10ca0dd6abfc82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 5144 bytes
font_01_sfnt_off0000d86d.bin
d95db9d962fa7d7347f2fccb7477d0ec43a344ed3ff23d463fc2462903949aa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 10296 bytes

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