Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c58b5940b446374…

MALICIOUS

PDF

42.3 KB Created: 2020-08-06 17:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59dd35bd7bb210c04f346a12266cdec6 SHA-1: 4da1cae9f875419b73667804367aa70a261ffc03 SHA-256: 0c58b5940b446374c9bac2f728034b96821939ca6af4b667a20b3e7be9aea12f
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document about "busy works beats chord codes". The link, https://ttraff.com/pify?keyword=busy+works+beats+chord+codes+pdf, is designed to lead users to further malicious content. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly indicates maliciousness.

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=busy+works+beats+chord+codes+pdf
    • http://segikawi.internallyflawless.net/uploads/1/3/0/7/130738748/foxaxumegew.pdf
    • http://files.thecalibc.co.uk/uploads/1/3/0/9/130969532/jewokobik.pdf
    • http://files.skinboostlab.org/uploads/1/3/1/6/131606094/ruzatodaketiweb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12410546401.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0566/files/lulodunusokel.pdf
    • https://cdn.shopify.com/s/files/1/0434/0390/3127/files/37242888892.pdf
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/67618693863.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/2967259039.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/letulizivegozinigasapoxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0577/9863/files/puts_on_sunglasses_emoticon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2478/5313/files/44113435172.pdf
    • https://cdn.shopify.com/s/files/1/0436/9619/3686/files/51803356102.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/figamu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/nevexamejasotewodoweron.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_off0000587c.bin
9682167fd444337585cc1ab3a83a5a71427d36dd049dc75b404169ccaa6ee4b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x587C 5384 bytes
font_01_sfnt_off00006af4.bin
a26237cbba65fe248f04f8b85ec1fe3bc7a5208c6476ab4d081e1ff9abc8ff75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF4 10320 bytes
font_02_sfnt_off00008e36.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E36 4324 bytes

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