Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a4538d3b97211a…

MALICIOUS

PDF

86.1 KB Created: 2020-12-28 15:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 126980d4b89d26e82b9cb42c7eef100a SHA-1: 1d4c15ff0d52292a07e1b11eaafa3666b916f24c SHA-256: 08a4538d3b97211a13a159e7bb5e305bd8c7afef777b1d9df023fe871799e94d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector pointing to 'gettraff.ru'. The document body, though heavily obfuscated, contains text related to academic papers, suggesting a lure to trick users into clicking the malicious link. The presence of numerous links on disposable hosting further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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/123?utm_term=patterns+of+entrepreneurship+management+5th+edition+pdf
    • https://pakedarisibibo.weebly.com/uploads/1/3/4/5/134501134/betilomunutojerof.pdf
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/5676924.pdf
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5fccdf5a2cd06.pdf
    • https://fokomowopijav.weebly.com/uploads/1/3/4/6/134643156/ketavifopaxufimumuz.pdf
    • https://danenogamapan.weebly.com/uploads/1/3/4/4/134481258/4163475.pdf
    • https://womurozini.weebly.com/uploads/1/3/4/5/134507066/f2f530af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/224b9833-11f8-4955-aa33-5c8fa84a3cbf/cocina_rica_y_nutritiva.pdf
    • https://s3.amazonaws.com/sazariwapa/antivirus_kaspersky_total_security_2019.pdf
    • https://s3.amazonaws.com/fewunadupop/kaspersky_total_security_for_business_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/b91f762e-f372-42e1-b667-0572f7d07bf0/tepurewiputodizon.pdf
    • https://uploads.strikinglycdn.com/files/939e0cfc-3c55-4309-996e-c5eebb6eb251/ucsd_health_beat_advising.pdf
    • https://s3.amazonaws.com/zumomasugipeno/67752626739.pdf
    • https://uploads.strikinglycdn.com/files/60b30279-acdd-4831-9c3a-c830402dc07d/97065655547.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/2001_polaris_sportsman_500_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/c8c42404-840a-4e26-8e4c-5f1c3320df91/zaloxavinoriluniw.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd62.bin
aeb70136dc54855a73ef31353f19edc4e0836ed34b61bbaca208f596586fc31f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 5548 bytes
font_01_sfnt_off0001101e.bin
5745c4f80a8ba8da99582e0b0edb84fced619a2fd88a3413d64f69df1d5e05d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 10852 bytes
font_02_sfnt_off00013563.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 16060 bytes

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