Malicious PDF — malware analysis report

Static analysis result for SHA-256 134cfdcef13932bb…

MALICIOUS

PDF

32.6 KB Created: 2020-08-29 22:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 070c8caf5a937d746391bc13b8d05d40 SHA-1: 3800deaf5b3ef1ec61c2c1bd438f2e32ccbc8c8c SHA-256: 134cfdcef13932bb1929c5a988b570ba15cf1061e9712fd69bbd6e529d94ad06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a movie download, which redirects to malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of similar links were generated, likely for SEO poisoning or link farming. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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=eragon+movie+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1625/6662/files/62819384475.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94192334972.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/patosutetatoxi.pdf
    • https://static.usrfiles.com/ugd/b8c837_8346e753212544c4a081fe7a97d82b1e.pdf
    • https://cdn.shopify.com/s/files/1/0435/6141/8913/files/movetarixisukotibuvudiduf.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/tibazifo.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ac059802fc34f08872ac0a45fc587c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f806d6b041e149b5afb2ac51ffb36c52.pdf
    • https://static.usrfiles.com/ugd/b8c837_39a44fc9681047a7a18a1bb62915b09d.pdf
    • https://static.usrfiles.com/ugd/b85eb0_2fba2be8131249a9afbdcf2af8dff21a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c05a9009fa644067b1e0193020c6a0eb.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_off000042f9.bin
7e64ebaf4293fe9714732637e53273c0ea8287bb912d560799dc65b67b31ae26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x42F9 5156 bytes
font_01_sfnt_off00005481.bin
37fc46c943a18f804f79b65afadcea649de7903d9ffd315d698942ed7937b2b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5481 9804 bytes

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