Malicious PDF — malware analysis report

Static analysis result for SHA-256 650043ace87b5b5a…

MALICIOUS

PDF

53.0 KB Created: 2020-08-30 14:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca15e182c70e20554f9262c3cfeb9d17 SHA-1: f1ecf8a084fda23b98591d5a5e0844f01cbb9a8e SHA-256: 650043ace87b5b5a127b81c524dd9fe86dfe88842edcb81f4ef1d4c8f0d6b128
162 Risk Score

Malware Insights

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

The PDF contains a lure for 'Toeic reading practice with answers' which, upon inspection, links to a known malicious redirector. The document also hosts a large number of SEO-optimized PDF links, likely to distribute further malicious content or engage in link farming. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wix?keyword=toeic+reading+practice+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0456/8544/0671/files/best_beat_making_app_for_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/classroom_action_research_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2023/9519/files/zamipamozofotepo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7667/2918/files/63492276213.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/73498924818.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7428/files/dumuvesofivodusajedafob.pdf
    • https://static.usrfiles.com/ugd/ce5d00_53f87e355ca740c8b34d2edbab8378c4.pdf
    • https://static.usrfiles.com/ugd/2f8cea_5a27db2a38c2463a8568b579b14149dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_85c5b475ebea4a0083cc6db326990085.pdf
    • https://static.usrfiles.com/ugd/97634b_da6d36c7194147c9b2b0cef2e7972456.pdf
    • https://static.usrfiles.com/ugd/b8c837_25ac3e0f25bb42f1a1fc6501181d2e5f.pdf
    • https://static.usrfiles.com/ugd/122077_cbd517e65156442eacf8aeb6813f35d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_57d564a4fd134b08b55684e92cca70d1.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ea.bin
07e2b1d2448a36f88b7ebf98a8767a922c2b7c6614844f3898be3b390c69699b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EA 5344 bytes
font_01_sfnt_off0000871d.bin
85a9ee1b126cf4455c8415a96843af170b3d9a0203638be3111811a980c09c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871D 14436 bytes
font_02_sfnt_off0000b20f.bin
7d8d393deaf7c828ecd37deb4761efb16373d12377da38114f9473febf69f79c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB20F 16144 bytes

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