Malicious PDF — malware analysis report

Static analysis result for SHA-256 727cc69242249b2f…

MALICIOUS

PDF

64.4 KB Created: 2020-12-28 10:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7f975d9e7f4f222cc0e694260e4f327 SHA-1: 16b25d4114f81f2197217d3f5872808d6a0a2f85 SHA-256: 727cc69242249b2f591820abfd78352e9614b92d290540d6f0a934c026bccb1e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to distribute traffic to other sites. While no scripts were explicitly extracted, the presence of numerous links and the ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=monster+truck+destruction+2+game
    • https://besogedawifajop.weebly.com/uploads/1/3/4/2/134234635/zosokijoveb.pdf
    • https://cdn.sqhk.co/zimevegi/jajdjjq/juwolufepikarojalon.pdf
    • https://cdn.sqhk.co/pujapipiwat/gcjea4d/75601328377.pdf
    • https://cdn.sqhk.co/lenawemijixe/VFkHYki/xupalusadur.pdf
    • https://kazigujexumakul.weebly.com/uploads/1/3/4/3/134320364/gogaguf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gagagakigibapo/disable_bloatware_apk.pdf
    • https://uploads.strikinglycdn.com/files/2c21b392-84ef-48d2-8113-f916e1ef3b59/75145510168.pdf
    • https://s3.amazonaws.com/wetevali/bangla_video_songs_telugu.pdf
    • https://uploads.strikinglycdn.com/files/d842e056-3d71-4465-bd98-f3213f7a2a61/toguropukadufise.pdf
    • https://uploads.strikinglycdn.com/files/fd48404d-4a0e-410c-b7ec-a5efcc3859d1/lgica_epistmica_concepto.pdf
    • https://s3.amazonaws.com/xilasisefi/uw_math_placement_test_scores.pdf
    • https://uploads.strikinglycdn.com/files/09fa45ba-8a07-4612-9f44-6365b5371b78/3290168231.pdf
    • https://s3.amazonaws.com/lovetijif/provinsi_bengkulu_dalam_angka_2017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b441.bin
084105fbd31224e7e25c4bf627f7215201240b19b857c9737e9d9c5b7e1b7495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB441 5428 bytes
font_01_sfnt_off0000c6aa.bin
e0da664fd6de993538708acb17e5ee70d4d90577e2ecc432fd2540831768d512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 2264 bytes
font_02_sfnt_off0000d0df.bin
0d1f4d9b2c4a4886bd5d065328f39799da2d46ff1aa6af5d4b582a30af486af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 10416 bytes

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