Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace345d945c8286e…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 21:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3063c48399604c08c2e86fd54bf7c46 SHA-1: 0ae5204910047989159f3326b3ec7ebb99446746 SHA-256: ace345d945c8286e5aa2e0246d22a6d04d45694744d4d3a58e85b51ae77de952
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.ru). The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous Shopify links, while mostly benign, contributes to a link farm strategy. The ML classifier strongly indicates malicious intent.

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=vanilla+wow+hunter+pet+leveling+guide
    • https://cdn.shopify.com/s/files/1/0428/4317/7126/files/autodesk_alias.pdf
    • https://cdn.shopify.com/s/files/1/0432/5467/7662/files/23371626255.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9284/files/hibbeler_fluid_mechanics_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/sufepomoburosavazo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6294/2101/files/the_odyssey_book_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/1396/2919/files/mutufidit.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/86011074667.pdf
    • https://cdn.shopify.com/s/files/1/0438/4410/8445/files/28728301215.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/mesumepuperexomijigen.pdf
    • https://static.usrfiles.com/ugd/b8c837_a79fbc4fff6349d8a55de628fba08f0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_605c73bb4fdf4a62acfc805c535965d3.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_off000060c1.bin
91d4f6934b7b63248e50780aca614c46d4716905e5ba7dbee703205938ed6e09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C1 5160 bytes
font_01_sfnt_off0000725c.bin
06d3c22ef188b48bac021cbda4c17e9bd75a8029d79e9d6b71ec479d0357546d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725C 10352 bytes

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