Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc2f9135afb2239…

MALICIOUS

PDF

36.7 KB Created: 2020-08-12 18:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 302da3b6471f8f7e78f5e27cd949378c SHA-1: e00ef6612bc56931125b34646cf17deca574acd0 SHA-256: dfc2f9135afb22391e66d4f862d60d45140652cf01d6953fec7e662c94cb1adb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the URL that triggered the redirector heuristic, suggesting the document's primary purpose is to lure users to malicious sites.

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.ru/pify?keyword=avalon+vt+737+manual+pdf
    • http://wofoniwov.louiselightworker.com/uploads/1/3/1/1/131163599/f164cb3.pdf
    • http://tamigos.everyotherthursdaypodcast.com/uploads/1/3/1/3/131383965/3412056.pdf
    • http://files.electaylin.com/uploads/1/3/2/7/132740320/8322645.pdf
    • http://lifov.microbesbymarco.com/uploads/1/3/2/8/132816066/3feecf4dd13f68.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31178329868.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5250/files/1697666996.pdf
    • https://cdn.shopify.com/s/files/1/0447/5827/0101/files/kopowopogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5167/0943/files/a_monster_calls_patrick_ness.pdf
    • https://cdn.shopify.com/s/files/1/0430/4456/9242/files/sutinaribumex.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/7345003537.pdf
    • https://cdn.shopify.com/s/files/1/0431/5529/2321/files/86365633662.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/katodajaroxinenebuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/piwivubigeziwulitiwuzowo.pdf
    • https://cdn.shopify.com/s/files/1/0446/9296/3484/files/77461853324.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005230.bin
59afe55c6fa37f3b14a3015e5c39490725313587d23b8ddaadb6b492fad64d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x5230 5204 bytes
font_01_sfnt_off000063ea.bin
05035d93a83b4aa8de6d791459f753e0be06dcb7c1390088408172fb1c833258
pdf-font-stream PDF embedded font (sfnt) at offset 0x63EA 10052 bytes