Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48f874accb1d533…

MALICIOUS

PDF

74.4 KB Created: 2020-11-24 05:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d973c9da672c6e1b4d2e7fd756eb32d SHA-1: 34562c40b6431a8dea21958722ed944f13bd540c SHA-256: b48f874accb1d53321b9f032df076043da4e1ba744530d495b7091360657f700
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=leviathan+raid+guided+game'. It also exhibits a PDF link farm behavior with numerous external links, many pointing to 'strikinglycdn.com'. ClamAV detection as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' further confirms its malicious nature. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=leviathan+raid+guided+game
    • https://puzemebakojufem.weebly.com/uploads/1/3/4/2/134234574/a5e10cb3412a4.pdf
    • https://cdn-cms.f-static.net/uploads/4408996/normal_5fa83bdae6c18.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74b4da93-1335-4f02-8183-1947f6bc61c2/barbara_cartland_gratuit_scribd_en_franais.pdf
    • https://s3.amazonaws.com/zurovajij/2004_yamaha_v_star_1100_fork_oil_capacity.pdf
    • https://uploads.strikinglycdn.com/files/4ffafc30-ecb6-4d39-b331-0b879c31d644/85819624488.pdf
    • https://uploads.strikinglycdn.com/files/fca72d8c-bce0-41f4-b6e1-c848d727e342/jeramupomifefi.pdf
    • https://uploads.strikinglycdn.com/files/37751b87-8454-4f76-a5f4-417fc0afd530/zetapepi.pdf
    • https://uploads.strikinglycdn.com/files/12d76384-58b6-4ebf-8085-f0328833524a/mudinezi.pdf
    • https://uploads.strikinglycdn.com/files/74137e05-8f98-484f-8d2a-16771ed8a44a/dinamicas_de_quien_soy_yo_para_dios.pdf
    • https://uploads.strikinglycdn.com/files/e3545e00-e8b5-44f2-bd8b-c5ea3fe1ad4e/23239527662.pdf
    • https://uploads.strikinglycdn.com/files/64f864c3-93d5-4a04-ad16-4e8f06efbc65/gozubuwavizofudopak.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4da.bin
eb8d67628a901d5fe7710f4e386404e47aa9b5a32989cce631a3efd0db1a1d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 3172 bytes
font_01_sfnt_off0000d028.bin
b5f0b4b8866191917c7cf88a11c3d08ac75914515d8a5a5f0e659f8d12917b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 5028 bytes
font_02_sfnt_off0000e123.bin
41845a64656cfa71fd0b34871c42d5d15208fd29e728e30446e540e106cf6910		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE123 11528 bytes
font_03_sfnt_off00010782.bin
8a02c072109af67031be64374fa0b0107fc8569691e792053b23713e8e8f99b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 16164 bytes

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