Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f6b0867934163d…

MALICIOUS

PDF

50.4 KB Created: 2020-11-07 22:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8481bb99b2eeeca7e2a15d72b1f1fe2d SHA-1: d77fd65d5fab14b8d6d8d391eb95f4016db676a0 SHA-256: c0f6b0867934163d1e133349775633f40b77eb6a0eac15a310c0d368c4bd08ec
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm pattern. One prominent URL, https://traffnew.ru/123?keyword=anycubic+chiron+mods, is embedded within the document body, suggesting a lure to a malicious or SEO-manipulated site. The ML classifier strongly indicates maliciousness, and the presence of embedded links points towards a phishing or SEO spamming attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?keyword=anycubic+chiron+mods
    • https://bujegeti.weebly.com/uploads/1/3/4/3/134355457/86887.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/jizikijegare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/palikuvexake/pugokuwanel.pdf
    • https://tafexoru.files.wordpress.com/2020/11/3294531957.pdf
    • https://lixedot.files.wordpress.com/2020/11/2kids_one_sandbox_original_video.pdf
    • https://s3.amazonaws.com/welanisowari/town_of_mattapoisett_beach_sticker.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/big_mama_thornton.pdf
    • https://s3.amazonaws.com/henghuili-files/balanced_scorecard_conceito.pdf
    • https://s3.amazonaws.com/sugaguxagu/lipodaronetej.pdf
    • https://s3.amazonaws.com/godoremitiwuja/mogevosewav.pdf
    • https://s3.amazonaws.com/mijedusovineti/awg_to_mm2.pdf
    • https://uploads.strikinglycdn.com/files/0c64dd2c-773c-4cea-990b-3bc2173d4329/97762090196.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_off000085ab.bin
f8c07e7a9ff03268704e2320ba7cdf37a2eb4968a5891c7e8e878e9e826b0403		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AB 5168 bytes
font_01_sfnt_off00009719.bin
9a6a2ea1cdaa290428de88e8015ec8feac39555727f107211f3f5d991e53aefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9719 11420 bytes

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