Malicious PDF — malware analysis report

Static analysis result for SHA-256 8396f500ef8cfb94…

MALICIOUS

PDF

75.3 KB Created: 2021-01-24 04:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a910c7627451bd9ebf1c2d6517715757 SHA-1: 88b54437a05c76e17e98bd80f56aac90f6e0dc6a SHA-256: 8396f500ef8cfb94b992aecf9243bd127b7f279b642d6a415b9fd62e75bc32c2
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a redirector link to `ggtraff.ru`. The ML classifier also assigned a very high probability of maliciousness. The document's content, though heavily obfuscated, appears to be a lure for a 'video call recorder app for android', directing users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/wb?keyword=video%20call%20recorder%20app%20for%20android In PDF document text
    • https://site-1174958.mozfiles.com/files/1174958/93062870852.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/32814474822.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/jghfjXj/aaron_donald_jersey_throwback.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hYigjbt/motorcycle_flat_track_racing_near_me.pdfIn PDF document text
    • https://site-1172117.mozfiles.com/files/1172117/14899307676.pdfIn PDF document text
    • http://janurikemodowu.iblogger.org/88534211213.pdfIn PDF document text
    • https://site-1168155.mozfiles.com/files/1168155/lloyd_s_risk_bordereau_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tipixerokofor.epizy.com/annotated_bibliography_apa_format_cover_page.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/nuvawipazevesuxapapogefux.pdfIn PDF document text
    • http://daxevekiwenux.epizy.com/tween_machine_maya.pdfIn PDF document text
    • http://nujuxat.epizy.com/livre_nutrition_musculation.pdfIn PDF document text
    • http://xatudoxi.epizy.com/lolujamulezamunepomik.pdfIn PDF document text
    • http://xabogubumux.rf.gd/liwavamamuputev.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/pefofez.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_off0000dec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC5 4644 bytes
SHA-256: c015dce088499ecfb266b84b61b617552e46ecdc44e4f34319d0a8455438509f
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10416 bytes
SHA-256: f0c3853e7f5273014c2a65d89c593cdade1dc3141ef6f02b6cdf071ab843734c
font_02_sfnt_off00011209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11209 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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