Malicious PDF — malware analysis report

Static analysis result for SHA-256 430b580d3c3e81bd…

MALICIOUS

PDF

70.1 KB Created: 2020-12-29 19:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e4f9b629771d26cc1562a3812859e0f8 SHA-1: 80291e30973fa25aca373343a5609e703822421d SHA-256: 430b580d3c3e81bd2f3824543a0321174b178aad13d5d1548f148495336e7c06
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a game mod, suggesting a lure. The presence of multiple external PDF links, some pointing to benign content and others to unknown or malicious sites, indicates a link farm strategy. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • 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/strik?utm_term=overkill+the+dead+survival+mod+apk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fdfc8846b614.pdfIn PDF document text
    • https://bupizezar.weebly.com/uploads/1/3/4/8/134853483/sorimapidu.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/a1KjaIV/ritijox.pdfIn PDF document text
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/zixuxitinasife.pdfIn PDF document text
    • https://cdn.sqhk.co/wediximewoza/SFjncia/fake_call_prank_lite_girlfriend.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/bdidZCV/switch_nintendo_lite_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a874ffef-baee-46e3-8372-316a143615e6/26453113795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18add038-85c4-4f7d-9754-3d28600105df/vaxovenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d907f0e-d5c1-4580-8149-cd698d582e5f/practice_4-7_geometry_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0e639f-887b-42c5-8c4e-67d3afe96225/12179252125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a09f5ae-4aca-486a-be18-4bdd8ab8d375/girusunuxowefij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e294018-a102-4d17-9f16-98dfa87ce39c/marisol_santa_cruz_desnuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4070f33-5638-47cb-9118-44e7b9270e9f/merazemikorigalidurut.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C9 5352 bytes
SHA-256: 047a78ea7304085007f7f14ccbfe2eb69871d15f9abe965f0d670eb24ccd12bf
font_01_sfnt_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 10840 bytes
SHA-256: 04b4b65c5aa79147eca2f5183da620cfe2ad25829184a1fd0565766364dc944f

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