Malicious PDF — malware analysis report

Static analysis result for SHA-256 3856769a28cd4fd4…

MALICIOUS

PDF

62.8 KB Created: 2020-11-18 01:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a36db6367be56dc2fd945b176b0b2524 SHA-1: fbc5cfa3ba703db879b83c17f3357e89ae9841f0 SHA-256: 3856769a28cd4fd49574d9c9637d8eb4869863afd52bf619e2e463e542b0063a
214 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to lure the user to malicious content, likely for phishing or malware distribution.

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/123?utm_term=will+you+press+the+button+unblocked
    • https://lulunanozox.weebly.com/uploads/1/3/4/5/134598725/gedufusujeda_banexisos_lawogike_famudavegosit.pdf
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/xoxitamusisigomuxezo.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/ravatuvazolumolela.pdf
    • https://cdn-cms.f-static.net/uploads/4372354/normal_5f996de192289.pdf
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/dujopixivilo.pdf
    • https://zapineri.weebly.com/uploads/1/3/4/7/134707132/mamedoximomido.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulozor/34743251228.pdf
    • https://s3.amazonaws.com/peveziwoguxuzam/47060288031.pdf
    • https://uploads.strikinglycdn.com/files/f6e2d3e2-396d-41c8-8dbb-653866629249/vamajemul.pdf
    • https://s3.amazonaws.com/boxalewijim/zikimobizi.pdf
    • https://uploads.strikinglycdn.com/files/109cf615-2247-4d12-b019-41ea7fae9dfc/alexander_the_great_hero_or_villain_project.pdf
    • https://s3.amazonaws.com/temujonuwu/lufepapavisik.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_off0000b082.bin
90e8abc77e43e0cc8485f8fa9ba0dc2363d7e86a84adc2e62616772780716d03
pdf-font-stream PDF embedded font (sfnt) at offset 0xB082 5272 bytes
font_01_sfnt_off0000c276.bin
cd0641431f6040412203ccf0cb8063f11c71348909b3236ed7330641580e62de
pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 14252 bytes