Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc9a7a726ffd039…

MALICIOUS

PDF

36.6 KB Created: 2020-08-21 21:38:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0bacc80c2e14afb100add45ee8dc60a SHA-1: bc8dd271e2356064b591a12e6e552ec81877debd SHA-256: 0cc9a7a726ffd039e7a8c0b2b64a9303ef87e1da93b195bbd99da55ab667d4f3
154 Risk Score

Malware Insights

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

The PDF contains a link to a malicious redirector, which is designed to funnel users to a large collection of other PDFs. This behavior is indicative of a link farm or SEO poisoning attack, likely intended to drive traffic to malicious sites or distribute further malware. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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://ttraff.cc/pify?keyword=lagu+dj+cinta+karena+cinta+metrolagu
    • http://files.ucalgarycase.com/uploads/1/3/1/0/131070688/c85759938b1c.pdf
    • http://files.thelostartoffemininity.com/uploads/1/3/0/9/130969772/1bf93ebba0976d.pdf
    • http://files.virginiamnhistory.com/uploads/1/3/1/3/131398333/wagilorexesa-jidowuwi-dajosezosaje-namuduxujipo.pdf
    • http://fobopin.pinelakemanor.com/uploads/1/3/1/6/131606490/nomipawodoreneda.pdf
    • http://files.theroombrighouse.co.uk/uploads/1/3/0/9/130969879/xamot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2682/4859/files/cheap_formal_dresses_in_toronto.pdf
    • https://cdn.shopify.com/s/files/1/0438/3296/7318/files/kukavoki.pdf
    • https://cdn.shopify.com/s/files/1/0435/2478/4292/files/nenolakafisoserafanuji.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/zepejifiw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/pexufowitatogaxa.pdf
    • https://cdn.shopify.com/s/files/1/0434/8113/7316/files/ravigikisitufakojaripidag.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/functional_skills_maths_level_1_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3786/files/xifujusama.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_off00004826.bin
07efd4b5ce35fe43d562a47bea6ca2be7e52a32f6dbf0d49a2a72276c44a66d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4826 3016 bytes
font_01_sfnt_off000052e1.bin
db6a24373b2144f74768cfe2758e0f79d1073fbec66ba98d41e894a257072b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E1 5160 bytes
font_02_sfnt_off0000645d.bin
68530cbb4c5045ee6e4d4878a8200188215e2a10c3a250a9b7da73fcf83a5e24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645D 9672 bytes

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