Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cfee9b52fd5a48…

MALICIOUS

PDF

62.0 KB Created: 2020-08-17 10:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9df463ef2c874f9d3a373e21578bc810 SHA-1: d4d81af799c2b141ffa0df5344784e58bb9c5fe8 SHA-256: 12cfee9b52fd5a485e856ad5a22255cd206325a62e7cc9e35564076acc0a195e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs, suggesting an attempt to redirect the user to malicious content. No scripts were extracted, but the presence of numerous links and the malicious redirector heuristic strongly suggest a phishing or redirection attack.

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.com/pify?keyword=greased+cookie+sheet+meaning
    • http://files.cl-projects-sound-design.com/uploads/1/3/0/9/130969614/sugukosunezalad.pdf
    • http://mamapoz.insidenanaskitchen.com/uploads/1/3/2/7/132740900/tefurag-rerewifevatip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/type_casting_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/8544/6824/files/696549843.pdf
    • https://cdn.shopify.com/s/files/1/0438/6842/2309/files/malayalam_movies_2016_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/marawaguti.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/tubuditulamiviri.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/duvefusore.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/texas_dental_jurisprudence_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/bandeya_song_video_free.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_off0000a847.bin
e788b1a1704ef8b3e3768d1ebf826d31fcfc12f5cbc10201cd1e2fd896430005
pdf-font-stream PDF embedded font (sfnt) at offset 0xA847 5204 bytes
font_01_sfnt_off0000b9cf.bin
8952ef2731508a8e9d45adc3d9e87fb4b2d4c62efe0d9ca1472c874a20e4e901
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 10352 bytes
font_02_sfnt_off0000dd2c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 4324 bytes