Malicious PDF — malware analysis report

Static analysis result for SHA-256 654ef74df5495dac…

MALICIOUS

PDF

96.2 KB Created: 2020-08-31 03:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31ea58f30c14a30e85ec70f3c36f7690 SHA-1: 3a83aa1984282b4875a9f0a06b119ef82b47538c SHA-256: 654ef74df5495dac2134eaa465af2a5d90ccc4013c09f3326fc0fe617aa4ca82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. The presence of a large number of external PDF links suggests a link farm, potentially for SEO poisoning or to obscure the final malicious destination.

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=saenai+heroine+no+sodate+kata+flat
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c12414_431da90f29954c8ebc150ab839276c38.pdf
    • https://static.usrfiles.com/ugd/b8c837_df04a3c7bfc34e81a87a5fd656363619.pdf
    • https://static.usrfiles.com/ugd/c836c3_8aec357456f74900ac8bdb41af4b4d8f.pdf
    • https://cdn.shopify.com/s/files/1/0429/1087/5815/files/php_parse_email.pdf
    • https://cdn.shopify.com/s/files/1/0431/0066/8065/files/matchbox_20_3am.pdf
    • https://cdn.shopify.com/s/files/1/0435/4532/9832/files/sapekunon.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/bogimujanaxadadiwuvomive.pdf
    • https://cdn.shopify.com/s/files/1/0434/1458/5509/files/case_in_point_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/5911/7206/files/segamisolararidivomezami.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/78127389719.pdf
    • https://static.usrfiles.com/ugd/253000_00f7f7463fea4844bd0622ac41b39607.pdf
    • https://static.usrfiles.com/ugd/b8c837_756280f7b4e343b4939720676291bbec.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c0b1f739eb242aa9231e83263d6eb70.pdf
    • https://static.usrfiles.com/ugd/f103bb_ba7bf49dc51d4edd9fd04dcfdc6f05a5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ab2000b8d6042e19db345e48f2bcbda.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4a9.bin
f883241844ae7c60068c8de8e0673e51171ec30e0a90ed6b2166f14db10e8f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A9 34432 bytes
font_01_sfnt_off00011d90.bin
61f559630df8c3851cb24fdd7159e03828cf43361f679364d32c0855e584a0f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 5164 bytes
font_02_sfnt_off00012f08.bin
74bed26ab77564bc96bcba1ddd83fcf813a898ae310e075381190a1cb20af742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 15152 bytes
font_03_sfnt_off00015e24.bin
2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E24 16120 bytes

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