Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b12812575b4b81…

MALICIOUS

PDF

34.9 KB Created: 2020-08-31 03:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca86e8ce6426ac84aaf45d9debc5db16 SHA-1: 546bfaed1ad777a4e61adc96060827fef9b61ca2 SHA-256: 06b12812575b4b81362c5cbb624a85cc56bf38eb646eae8c94b3b8b893523bb6
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a redirector link to a known malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wix?keyword=libro+de+texto+de+quinto+grado', which is flagged as malicious. The presence of a large number of external PDF links, many pointing to Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content.

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/wix?keyword=libro+de+texto+de+quinto+grado
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6372/9557/files/nosox.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/92222698339.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6839/files/37401296736.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/mtg_objective_zoology_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_07a66f47cd6d43139eb519c32810930a.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_bf2e02d460014c0cb00a74a450799a43.pdf
    • https://static.usrfiles.com/ugd/b8c837_f4f2d3a8e00f4a29adb9ef6f804fe0dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_40a453eaa689443c9fd4749d3652104d.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_c9d5d2b93a9e471aa0690b3f2190af04.pdf
    • https://static.usrfiles.com/ugd/5899d5_c1960b3c198346898aa6fe8c4332d71a.pdf
    • https://static.usrfiles.com/ugd/b8c837_a21a8a102c63441cb91f9197f9880daf.pdf
    • https://static.usrfiles.com/ugd/0a593f_4be5fe3b048b4a659661a532b7381059.pdf
    • https://static.usrfiles.com/ugd/5899d5_e6606e2056534b359e0829545fa1b02f.pdf
    • https://static.usrfiles.com/ugd/2d1648_d5793351dab7472fabbbc1c53f68af9f.pdf
    • https://static.usrfiles.com/ugd/726ec9_d5f9eb6e6d3d48c4a48966dd0bab3ec4.pdf
    • https://static.usrfiles.com/ugd/fedf23_6358ea23c5c84accb714c5479b53ab74.pdf
    • https://static.usrfiles.com/ugd/3b47cb_4038dfc03a4947b793316793b1d4b661.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9e49ccab4d2473b92c51524267b7cea.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_off00004981.bin
9fbb5c81bb7384067a0b4fc54a81fd42287e1183d57fef2a79c23c656e40676d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4981 5056 bytes
font_01_sfnt_off00005ac0.bin
eabb32e3cf55dd5e86efb7490bc171045f49c642c343646b812573aefd11761f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC0 10584 bytes

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