Malicious PDF — malware analysis report

Static analysis result for SHA-256 670a772dbf8085e4…

MALICIOUS

PDF

45.1 KB Created: 2020-08-29 20:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368261bba8841fe7b57537cbefa175ed SHA-1: c632725304c6ed07a60f7193e09595366a86c34e SHA-256: 670a772dbf8085e48a31a826ffba454fdfaf0ae6b5b3a83dbf88fb0af9f36a87
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic identifying one link as a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and other benign-looking PDF links, suggesting a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious.

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.ru/wix?keyword=portada+de+una+antologia
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_442329143f1244b99b68507da90d1fdc.pdf
    • https://static.usrfiles.com/ugd/6924eb_2a506997d1ed48b089ecc75891866b3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a178015c2314479db8ab9896ec9aec0e.pdf
    • https://static.usrfiles.com/ugd/63022f_088f699a1130420e812157e1cddfce7a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e07387318ce4705b798c2e772f050b9.pdf
    • https://static.usrfiles.com/ugd/5b604d_6a8b040866c34e8893e5c1747bfac93c.pdf
    • https://static.usrfiles.com/ugd/5b9365_4b112492baed4cecaf867931e1c01358.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3215/files/assumptions_of_multiple_regression.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/29716736512.pdf
    • https://cdn.shopify.com/s/files/1/0435/9058/2435/files/tobapanarisiveveg.pdf
    • https://cdn.shopify.com/s/files/1/0428/1237/5207/files/tafusukavodevuzelir.pdf
    • https://cdn.shopify.com/s/files/1/0435/1780/4708/files/10013553262.pdf
    • https://cdn.shopify.com/s/files/1/0430/6557/3537/files/gali_chirugali_telugu_dj_song.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/53569300683.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006501.bin
6ddf654c3f42aecc111e06edeedc4bdac195d2372d1cb6fba93013957de94cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6501 4700 bytes
font_01_sfnt_off000074f9.bin
cc9355a300c3fa2d787bd88eb4be7e18b3132c6c8bfe26833c4f9f8ac7528964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F9 10780 bytes
font_02_sfnt_off000097db.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DB 4324 bytes

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