Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9d5739f0f793ea…

MALICIOUS

PDF

71.4 KB Created: 2021-01-11 11:06:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f04cecafc0c0091ccc76c0bac02282cc SHA-1: 7f691e358f13c927d93cb7f6c3ddbac0fd4e228b SHA-256: ff9d5739f0f793eafae3ed2ad4ad147f17906d8f9c233a29f8e8befe2ce0bf14
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL, https://gettraff.ru/123?utm_term=two+chicks+and+a+hammer+airbnb, is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains fragments that suggest a lure related to a popular rental service, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=two+chicks+and+a+hammer+airbnb In PDF document text
    • https://site-1175981.mozfiles.com/files/1175981/87535552573.pdfIn PDF document text
    • https://site-1204352.mozfiles.com/files/1204352/ximosej.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/fish_wars_hungry_fish_game.pdfIn PDF document text
    • https://site-1179585.mozfiles.com/files/1179585/lenovo_ideapad_duet_chromebook_tablet_128gb_za6f0004nl.pdfIn PDF document text
    • https://site-1168115.mozfiles.com/files/1168115/merisotezumonomalev.pdfIn PDF document text
    • https://site-1177169.mozfiles.com/files/1177169/touchgrind_skate_2_full_apk_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490739/normal_5fc7e57732439.pdfIn PDF document text
    • https://site-1177347.mozfiles.com/files/1177347/miranda_cosgrove_about_you_now_lyrics.pdfIn PDF document text
    • https://site-1172756.mozfiles.com/files/1172756/john_gba_pokemon_fire_red_cheats_rare_candy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446401/normal_5fe17958e7f1a.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/widiku/jidozu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4D 5392 bytes
SHA-256: 8355414f5d8eda164a829074bba2dfb39b960215aef701b55d7d40917787a6c6
font_01_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 4696 bytes
SHA-256: b5fcc831d706d404017f15e68e8c89e2d2b1c70fd616770a7b331d3cdf68b9eb
font_02_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 11164 bytes
SHA-256: 08ec5adb97d47871906f78beeb0be867b2464bc0485cd31fcf21786012a92874

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