Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c95daedc4b46062…

MALICIOUS

PDF

76.1 KB Created: 2021-01-03 12:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bdb23410e36f7b6a11b8c4b9c0327b0c SHA-1: d62195fca4d8487809bc84674c3f695d84f47bbf SHA-256: 4c95daedc4b460622296e008d0541e573c35316e8cb8b9cd53b9c63e09e0cba9
222 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its critical heuristic firings indicating it links to known malicious redirector infrastructure and functions as a link farm. The document body, though heavily obfuscated, suggests a lure related to a 'Sensory system worksheet pdf'. The numerous embedded URLs, including the primary malicious redirector at 'https://gettraff.ru/aws?utm_term=sensory+system+worksheet+pdf', are designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=sensory+system+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370052/normal_5f88a80be11e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369146/normal_5f88d83628196.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/giijheC/evolution_movie_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/ehfktbm/gba_emulator_ios_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_5fb45c2736a27.pdfIn PDF document text
    • https://fisabovetusita.weebly.com/uploads/1/3/4/5/134597566/9466849.pdfIn PDF document text
    • https://cdn.sqhk.co/bipobulif/ghfjaMf/dish_anywhere_app_on_roku.pdfIn PDF document text
    • https://cdn.sqhk.co/delinilipo/btrSxha/pixel_worlds_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/dalubevemex/jdhbEhh/shogun_express_fairview_avenue.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/iffSIIr/bird_rescue_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/Sygdcjg/drive_ahead_apk_all_unlocked.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/8113539.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/jovekus/sentencing_guidelines_non_domestic_burglary.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/wpf_itemscontrol_switch_datatemplate.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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5400 bytes
SHA-256: 2b81811b2e953e3fae9d7c1ac205d37249f5d9b9f41c8321d4c25ef7f6a24357
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 10496 bytes
SHA-256: 8e129922f8d2b485f17cfdbcc6548552cd751b33d89edf957397f312fdc0594f

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