Malicious PDF — malware analysis report

Static analysis result for SHA-256 46685b4b89b85a2f…

MALICIOUS

PDF

48.3 KB Created: 2020-08-13 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 304eb6d5226165a6e057c4af8b6b40e9 SHA-1: 47b511fccee6d61827ef7a71edfecb6e828eeb46 SHA-256: 46685b4b89b85a2fc3692b4176454dbd3c36e5c0dd21f2d152d7bc6068e13b8a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lure users into clicking on further malicious links. The document body, though heavily obfuscated, contains references to 'learn spanish beginners pdf' and multiple Shopify URLs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is a malicious redirector.

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/wb?keyword=learn%20spanish%20beginners%20pdf
    • http://files.alchemist--designs.com/uploads/1/3/1/3/131383325/9a4b7e6c3ab.pdf
    • http://pixekir.johnfeeneyfuneralhome.com/uploads/1/3/1/3/131381428/jasutivexowep.pdf
    • http://files.thechurchinindianapolis.net/uploads/1/3/0/7/130776728/zinuzigo_bevenosax.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/27626066833.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/48111789715.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/21423969822.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/it_201_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8214/files/70423916815.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4142/files/motorola_minitor_v_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8477/4552/files/pujorebawodedugoxaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/cashflow_101_game_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/4782/8133/files/dajosekesigulalari.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/buliwepumewodedajixid.pdf
    • https://cdn.shopify.com/s/files/1/0433/9171/3447/files/zunugufaniwevovogadolaju.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e22.bin
5f17c88684eb80dc07e4da011c86b8cbf42f8c4b1ab1f25c83de842d42040e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E22 4948 bytes
font_01_sfnt_off00007ed4.bin
cdd28561d968489708d19c6cb0e5f1603aa90723affdc308d7f55811ccc4d645		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED4 12224 bytes
font_02_sfnt_off0000a667.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA667 4324 bytes

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