Malicious PDF — malware analysis report

Static analysis result for SHA-256 9106ef2ee6b395e9…

MALICIOUS

PDF

91.5 KB Created: 2021-01-08 08:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1875cbb959caa78f2e85f1a779130f3c SHA-1: f112bea04af14d76a2de4d07c896f9ab631cd8a1 SHA-256: 9106ef2ee6b395e9ee4d2d721e540a65605c129eba73ad6ca8426a6d17643f25
214 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://cctraff.ru/aws?utm_term=helldivers+steam+guide'. Another heuristic indicates a PDF link farm, with 'https://s3.amazonaws.com/remeranexe/luduzemi.pdf' being the first listed. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to 'Helldivers steam guide'. The presence of these links and the lure strongly suggest a phishing or malware distribution attempt.

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://cctraff.ru/aws?utm_term=helldivers+steam+guide In PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/dokiwanisexowes_wamapivunuxep_gokofe.pdfIn PDF document text
    • https://sumijiluwovoj.weebly.com/uploads/1/3/4/2/134266387/pavasu.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/xicugfb/hobby_lobby_coupon_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/FidheSU/subokawiwezo.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/dilitiwubozi.pdfIn PDF document text
    • https://cdn.sqhk.co/xolafunodo/Cjcbgiw/old_school_arcade_games_android.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/remeranexe/luduzemi.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/chocolate_video_songs_hd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/89899042894.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/31511690368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/710ddc9d-53e4-4525-a4e1-75b45385b4a9/weighted_averages_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b52550f-6af9-4fb5-8bdd-1d6323762c18/fayetteville_public_library_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/ant_intelligence_ielts_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10feb0be-7a00-46be-9245-7ec2d08d03ce/farm_master_tractor_price_in_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c45006-4f05-47ed-8d6c-e7cce0a46fc3/sememafavudufitin.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_off00011b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1F 4832 bytes
SHA-256: 92f2a5d3082e45ae17822ea1e0a25dedc6ef12a429c7c2614e7f017f55d6db8c
font_01_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 11644 bytes
SHA-256: de10048487eb68f0ed9de9aee897c4379b4ca775e4a6717ee6c393b8be07b0f4
font_02_sfnt_off000152f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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