Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ffab3195725014…

MALICIOUS

PDF

67.3 KB Created: 2020-11-23 11:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbb39d8d547b04ceb8d866565a48a4c8 SHA-1: 123f8266a2f29de92e6c49511a1f4ac78cadee45 SHA-256: a9ffab3195725014e4d9d4cd6bec767f66f242cec506847c5980f9ae65e89758
222 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to a link farm designed to obscure malicious redirector infrastructure. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and the ML_NYX_PDF_MALICIOUS flag strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'iphone app free download', suggesting a lure to trick users into downloading unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=heads+up+iphone+app+free+download
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/vozetovuxukelul.pdf
    • https://cdn-cms.f-static.net/uploads/4369498/normal_5f895b823a074.pdf
    • https://cdn-cms.f-static.net/uploads/4383460/normal_5f8deebca5a4b.pdf
    • https://zilexewutefak.weebly.com/uploads/1/3/4/6/134608169/xutukexaxotubadiw.pdf
    • https://bajusumuke.weebly.com/uploads/1/3/2/7/132741128/ripifotenero_kilipir_tawugimagip.pdf
    • https://ketibavobatuver.weebly.com/uploads/1/3/4/8/134849788/fisikitura.pdf
    • https://merokiniperoj.weebly.com/uploads/1/3/4/6/134691049/kaxej.pdf
    • https://wopusuxosar.weebly.com/uploads/1/3/4/5/134583764/ea80a33b.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/biviw_giguv_liwonir_wozowabov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/magapeguwabe/openfoam_user_guide_5.pdf
    • https://s3.amazonaws.com/divexikav/diccionario_etimologico.pdf
    • https://uploads.strikinglycdn.com/files/ad16ada0-cd5b-4a62-8c71-218d01579fcc/honeywell_th3210d1004_wiring_diagram.pdf
    • https://s3.amazonaws.com/pazifetanegapu/abraham_maslow_theory_of_human_needs.pdf
    • https://uploads.strikinglycdn.com/files/d2ac39dd-8f4c-40fa-a5fc-c15506323a71/devik.pdf
    • https://s3.amazonaws.com/napisakaluja/parents_guide_monster_musume.pdf
    • https://s3.amazonaws.com/fedufiporara/i_robot_worksheet_answers.pdf
    • https://s3.amazonaws.com/mubemutolewe/64249133187.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab5.bin
74b28ce6dec3feffe9b11ffaf9826fa4b3f7bfd66589f8b23758fe7c407697ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB5 5180 bytes
font_01_sfnt_off0000dc66.bin
e48c72095fea57a781cec7c024260da61f4355e74c4f66750b6f64b878a806fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 10560 bytes

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