Malicious PDF — malware analysis report

Static analysis result for SHA-256 8107bcd836c0b373…

MALICIOUS

PDF

80.8 KB Created: 2020-12-31 16:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: afab736c448be3bc9ca4665fc3f9e54f SHA-1: 9fdea5b214d4a7b7776b358655e2e096dfd017d7 SHA-256: 8107bcd836c0b373ec47591de0c2f0fdf63a654d9cd5a220550e021fc112f9b0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=chicos+monkey+farm+death'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the redirector suggests an attempt to lure the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/123?utm_term=chicos+monkey+farm+death In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_5fa0b77b20d36.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/hibQjbE/59488210410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5fb318ac46b07.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/remuv/gipuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8717669b-f8ec-48af-a7d1-bec9325c8186/zel_eitim_snav_sorular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa83e34d-3b98-4eef-8c6d-d8a21cc5a409/sefuwukaxexixekufinabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e704d0-b065-45b5-b5f9-8a312a2d3efb/counter_strike_1._6_cd_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/online_economics_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/ernesto_cortazar_autumn_rose_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/570f81e9-cdb3-4992-8141-6a923881fc2c/nerunubos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a543378e-5c28-4cec-b929-318fbb86d780/33751239474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6f3baf-f730-4172-9007-dd9b382569ce/raxejomonufavixasofaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/facebook_photo_album.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/ihsa_basketball_scores_2019.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_off0000fff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF8 5300 bytes
SHA-256: 553e0956e9b52132d8613e5e530f8cc85d0ef86641e67a747b5e40781b2bce28
font_01_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 11056 bytes
SHA-256: 84c60c0019e322e970e80aa9cf54a5ca687c4839ded58ec97243d976517ded68

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