Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f323141f5717e2…

MALICIOUS

PDF

40.6 KB Created: 2020-09-03 12:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c21fa8e72bbeac12c1c9c280d880118b SHA-1: 2072d43a68aa12db2ce8873eacf2463046efb6b3 SHA-256: b2f323141f5717e222e0ef36ff12e03a3919672fddd9e5088e00349f64cc49c1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.link/wix?keyword=marvel+avengers+academy+game+mod+apk', is presented in the context of a game mod download, suggesting a lure to trick users into clicking. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.link/wix?keyword=marvel+avengers+academy+game+mod+apk
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89965927340.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/kuleduwezefirividago.pdf
    • https://cdn.shopify.com/s/files/1/0437/8787/8549/files/jedifewatexef.pdf
    • https://cdn.shopify.com/s/files/1/0462/3810/5749/files/ejercicios_de_sucesiones_numericas_para_primaria_doc.pdf
    • https://cdn.shopify.com/s/files/1/0435/6633/4111/files/neoliberal_institutionalism_in_international_relations.pdf
    • https://static.usrfiles.com/ugd/b8c837_53ed3c5fc2ae476893ca132eca976b80.pdf
    • https://static.usrfiles.com/ugd/66c878_425bd5b72825407aa318441a414fcd7e.pdf
    • https://static.usrfiles.com/ugd/345929_0385356913194d4da95afbcfa4b3c206.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/zatulotuxegiziri.pdf
    • https://cdn.shopify.com/s/files/1/0434/2530/0647/files/20552023708.pdf
    • https://cdn.shopify.com/s/files/1/0435/1790/3008/files/xolewejabopezulabele.pdf
    • https://cdn.shopify.com/s/files/1/0444/3914/2566/files/61437308595.pdf
    • https://cdn.shopify.com/s/files/1/0440/4982/5942/files/emergent_curriculum_lesson_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/tavagagobuzomiliferup.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9461/files/manualidades_con_reciclado.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_off00005ed9.bin
6e41a9377189d602a0d81fd07b9000c16f89be19cff8fe0b9bce1c831cbab6d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED9 5624 bytes
font_01_sfnt_off00007207.bin
a6bc4ac477c2be3373d9cf99c7471d59e774199b8ab76c2336babe259191f881
pdf-font-stream PDF embedded font (sfnt) at offset 0x7207 10384 bytes