Malicious PDF — malware analysis report

Static analysis result for SHA-256 35873d1834a9b219…

MALICIOUS

PDF

71.0 KB Created: 2020-12-01 04:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb0af9dc8d8e19b8964c92cbb77fe404 SHA-1: d1a14f6c151ac144bd0a3fbdffb8968e5603fbcf SHA-256: 35873d1834a9b219666ac0ded3cc784adcffe2ea9f40c728064c20e74cf74e15
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?utm_term=ben+10+stinkfly+voice'. This indicates the document is designed to redirect users to a malicious site, likely for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://cctraff.ru/strik?utm_term=ben+10+stinkfly+voice
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/gezumuwavizegekis.pdf
    • https://ruxibero.weebly.com/uploads/1/3/4/4/134403554/35caf0b05963.pdf
    • https://cdn-cms.f-static.net/uploads/4475727/normal_5fa89ef8bafcb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c43fc4ee-7690-49a6-a450-5670f69a60cc/comptia_a_220-901_and_220-902_exam_cram_free_download.pdf
    • https://uploads.strikinglycdn.com/files/86905745-9649-48a0-84a7-45c1c5c79c15/noise_reduction_coefficient_table.pdf
    • https://static1.squarespace.com/static/5fc167576609fd0ee794de9f/t/5fc53cb608845d0924354f84/1606761655973/67354160016.pdf
    • https://s3.amazonaws.com/lezopobigeza/determiners_worksheet_for_class_5.pdf
    • https://s3.amazonaws.com/jokotaziweluge/jofumeligegapafimazaj.pdf
    • https://s3.amazonaws.com/nuxepiduded/apollo_13_strain_thc_content.pdf
    • https://s3.amazonaws.com/libusamagowuvo/no_soy_perfecto_pero_te_amo.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1f884f98375720a91ef4/1606295434123/29694184110.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_off0000ca18.bin
852b6c3f42715b87edd1a58eb8fccfe1b237e3e93069a0e1e4e41a8ac019e292
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 4416 bytes
font_01_sfnt_off0000d9b3.bin
65e5cdb467007e830634534b54030809c8690712f5ee2d0a91ca8bd8326302e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 5036 bytes
font_02_sfnt_off0000eb14.bin
391a797bc91cea1cfa96694312c83ddc7b513b05046585852a331b86d70f2ea1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10560 bytes