Malicious PDF — malware analysis report

Static analysis result for SHA-256 135133401ba2bede…

MALICIOUS

PDF

39.8 KB Created: 2020-08-28 05:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed2d904fdcac32a344338014c5005281 SHA-1: 2c6766c2549f2e40c992718c920a5c0ebe7e03f4 SHA-256: 135133401ba2bedec1638b2cb5528f726d54db3801df83feab3b84e88786eced
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic indicates a malicious redirector link to 'ttraff.com', which is likely used to obscure the final malicious destination. 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.com/pify?keyword=how+to+write+a+diary+entry
    • http://files.sapritalia.com/uploads/1/3/2/7/132740435/96ae52b.pdf
    • http://files.precisionimprint.net/uploads/1/3/0/8/130814680/potaki-topibatalaxafem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/domizigedaguzus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6599/9511/files/46261145766.pdf
    • https://cdn.shopify.com/s/files/1/0440/8714/8709/files/fewopokexi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/rosakisusexamubeminir.pdf
    • https://cdn.shopify.com/s/files/1/0455/5482/7429/files/anglo_saxon_literature.pdf
    • https://cdn.shopify.com/s/files/1/0449/0631/5943/files/hotmail_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0460/0555/1271/files/92632154206.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/cambridge_test_for_young_learners.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/41995684356.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_off00006130.bin
3f10b53e0fe104c1d0b696852b920c9a092acfcf17c50150a89ed40a0c0ae541		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6130 4764 bytes
font_01_sfnt_off0000717e.bin
ec64295e814be849d69237bba3be1545b62d614c1de415ef7401da1506f516bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x717E 9820 bytes

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