Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f0900847408172…

MALICIOUS

PDF

40.3 KB Created: 2020-08-04 23:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4fd0d1653214288da860a6543c0d387 SHA-1: bbf07522dc3a8271aee83733797192b737389e35 SHA-256: 89f0900847408172dfd6d194fd8ce3b3773a3291009831b7328e46dab2c80361
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it's 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/pify?keyword=autocad+2020+pdf+to+dwg+conversion
    • http://dewip.elcaobointernacional.com/uploads/1/3/0/7/130739415/jepajerixugakat.pdf
    • http://files.ccstormwater.org/uploads/1/3/1/4/131437532/tisudogibujeredu.pdf
    • http://files.leslieslanguage.com/uploads/1/3/1/4/131437987/93f08f586627.pdf
    • http://files.broadcastcoffeeroasters.com/uploads/1/3/0/9/130969448/bubibize.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/70130229712.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/99604576160.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9175/files/tafuki.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/liselisadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/97059766190.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/otc_fuel_injector_cleaner.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/53582559259.pdf
    • https://cdn.shopify.com/s/files/1/0451/1324/5848/files/steal_this_computer_book_4._0.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/siwizobudavegi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/72335125606.pdf
    • https://cdn.shopify.com/s/files/1/0432/7361/7576/files/27653093257.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/satasoxapoxid.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/sewagonanolizunowidi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e43.bin
0516afd2e1f9b2a3a433fcbe0e2db587c3e0c8e7021fbe5a7570bfef9b4b4a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E43 5708 bytes
font_01_sfnt_off000071e5.bin
885ccccc1bbae049b338ddaaad0263e7d483493d86df0d021dea0c4437115795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E5 10052 bytes

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