Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4264808238307f…

MALICIOUS

PDF

71.2 KB Created: 2021-01-05 06:34:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12a6930dce67b789b95a4713d6b49cfc SHA-1: ed835966743d35e727c1eb7a28f886939711a839 SHA-256: 8a4264808238307ff1cb0a7dd154c3d9941adac369f9bdca209f915ee2a8dbf5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or are part of a link farm designed to manipulate search engine results. The primary malicious link identified is 'https://ggtraff.ru/aws?utm_term=brolly+sheets+duvet+protector+review', which is flagged as a known malicious redirector. The presence of numerous PDF links and the ML classifier's high confidence score indicate a phishing or malicious redirection attempt.

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.
  • 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
  • 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=brolly+sheets+duvet+protector+review
    • https://kavuxidawikux.weebly.com/uploads/1/3/4/0/134000359/aca7702c5fed.pdf
    • https://cdn-cms.f-static.net/uploads/4452626/normal_5fb7a1182b175.pdf
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f903b07dd468.pdf
    • https://cdn.sqhk.co/bujavenizake/geAc2ji/kugilamakofujetijeduvetin.pdf
    • https://cdn.sqhk.co/wunasesev/jhXOibk/22231614318.pdf
    • https://cdn-cms.f-static.net/uploads/4414696/normal_5f9fd77fbc80e.pdf
    • https://cdn.sqhk.co/bagekaketox/viajbhi/indoor_go_kart_track_orlando_fl.pdf
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5ff3ea59383bf.pdf
    • https://static.s123-cdn-static.com/uploads/4447101/normal_5fc6c66dd95c5.pdf
    • https://cdn.sqhk.co/dajebala/jjjfJgc/15821644260.pdf
    • https://cdn.sqhk.co/gitesafuwu/0igjjEf/best_free_open_world_games_ps4.pdf
    • https://cdn.sqhk.co/ludozenidi/ggjibLv/ravens_steelers_box_score.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/liwara/tuwikatuzujepesiradivipiz.pdf
    • https://s3.amazonaws.com/zetubakuz/verizon_wireless_moto_g6_manual.pdf
    • https://s3.amazonaws.com/bogeguva/vekevojazu.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_off0000d684.bin
ebdef3f86c6f59912488598e559fc534d8b3960c074cf273e9fd2c5f9c7edae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 5256 bytes
font_01_sfnt_off0000e880.bin
e5fbbfac8e863742b7fdf7333711671a5e7d239ca236e3acff42a815009e58a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 11188 bytes

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