Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44a71afe7125925…

MALICIOUS

PDF

80.6 KB Created: 2020-11-17 23:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c08f0227a33a6923ff2969899ae89308 SHA-1: db70b95cd46933bcbb23bd3d1a94a6cca091eee8 SHA-256: c44a71afe712592522c18744649ae318e099f4ab23754ee24f2a9a9d6cdb8215
274 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?utm_term=free+vr+porn+app`. Additionally, it exhibits a 'Recovery secret / private key request' lure, attempting to trick users into divulging sensitive information. The presence of numerous external PDF links, including one to `https://s3.amazonaws.com/nagev/the_giver_final_exam_study_guide_answers.pdf`, suggests a link farm or redirection strategy. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://cctraff.ru/strik?utm_term=free+vr+porn+app In PDF document text
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/bikewepilepo-gapigemekak-biwizeluniwu-volozoperefi.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/feluzoxusuta-faginabavulow-rekegivi-demiloboxikuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459939/normal_5fa22ac255bb3.pdfIn PDF document text
    • https://figurera.weebly.com/uploads/1/3/4/4/134437403/zabexokel.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
    • https://s3.amazonaws.com/nagev/the_giver_final_exam_study_guide_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cd1df8-566c-4115-9562-17cedb215d57/gevagobibojelewefu.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/return_man_3_espn_arcade_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4de5c08-5d6a-4320-8131-fbc427413c4c/1446291001.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/54506655934.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/84775986871.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/pevuso.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/hp_595_p0084_review.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/wokil.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/final_fantasy_10_lulu_ultimate_weapon.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/63403964202.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 4280 bytes
SHA-256: 729ccfa886e513b30dbdc58d71ef1d1e7f3b7a08dcdd0584a8bc40c00f6eea82
font_01_sfnt_off0001019a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019A 11128 bytes
SHA-256: 022e40e2c2152df85b16824e8f97c32bd80603231989eb2ee1172cfbbdec2a3e
font_02_sfnt_off0001275d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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