Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7d047333b10e93…

MALICIOUS

PDF

67.8 KB Created: 2020-12-28 20:58:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 16acce06010334c7269bf01f65a9b4a1 SHA-1: d34b3a877ecb791a3148cae224eb099adbe4a26e SHA-256: ef7d047333b10e932b7b2b860ae929b09d4b123bde7af76c2dee65d1dcac7e4d
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm with 26 external PDF links, including a critical redirector link to 'https://cctraff.ru/strik?utm_term=stickman+arrow+archer+fight+download'. The document body, though heavily obfuscated, appears to be a lure for a game download, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=stickman+arrow+archer+fight+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5fbf446e88207.pdfIn PDF document text
    • https://jorimedazaget.weebly.com/uploads/1/3/0/7/130738946/boxaj.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/APjcicf/46182587292.pdfIn PDF document text
    • https://cdn.sqhk.co/mikakiraw/AiaFoa8/beat_fire_edm_music_gun_sounds.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd170711-2e43-4a99-9d91-a661d5a6ff0c/symbol_for_dictatorship.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34607a3-51ac-4469-ba9e-8e398f32d104/32629850176.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/lufebawatonelujuxulomero.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/abrsm_piano_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d8ecfd-df40-4589-8d63-1b385a11b029/manual_outlet_timer.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/40500330351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8474789c-c5ed-4feb-ae9f-a4b5a311d23a/78082524760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4c4244e-accd-4614-af69-08c20b1b4db8/pampered_chef_large_bar_pan_1446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17922897-9bcb-49be-9df5-478bb8ef46f0/del_norte_county_jobs.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_off0000c9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AB 5516 bytes
SHA-256: 791f92408bc29bf6425d827abdc029f77761bb521d98c10793182003219e4f8a
font_01_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 11452 bytes
SHA-256: 53da8b9abdfb612a1774bcd2e97bf0f1f6fd2e73b99a6bfd5a768e4eb599fb17

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