Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa8d3e910be04489…

MALICIOUS

PDF

65.2 KB Created: 2020-08-10 21:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d491eb940c5e3df3c27397c3a4e1c3f8 SHA-1: 6e81d93a15775346cf3d4cf03f6dfe2f4d21f1a5 SHA-256: fa8d3e910be044891e2dc5579494465044b79b78de14eb4fb25ba22450e26699
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous URLs, with a primary redirector identified at 'ttraff.ru'. The ML classifier strongly indicates maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.ru', are likely used to lure users to malicious websites for phishing or malware delivery. No scripts were extracted, limiting the analysis of direct payload execution.

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/pify?keyword=achilles+eccentric+protocol+pdf
    • http://files.vbstlh.com/uploads/1/3/1/6/131637147/vurupenukojepuf_buwasedepipu.pdf
    • http://files.changedbythomas.com/uploads/1/3/2/8/132814906/pejonal-bezixazatol.pdf
    • http://files.ballboss-stories.com/uploads/1/3/1/8/131856374/tabepadozirewow_bigukatavewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/girawojepanolujinuravosoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1781/files/34320558581.pdf
    • https://cdn.shopify.com/s/files/1/0432/4858/2820/files/tegetod.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/xuzezarekobara.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/31522698796.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/jaritaribezadodepaluzedig.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/24364285166.pdf
    • https://cdn.shopify.com/s/files/1/0429/3571/3958/files/60498354674.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/65135212901.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/muvamax.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fcb.bin
8b4330e0d35101df6d92893f40bc0c4930d9a3d7072affa3ac28905689a1f606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FCB 4812 bytes
font_01_sfnt_off0000b00b.bin
6ac0448452c198820ea7325e3cff8c9ac6444049a6ab90e6ae118e29b8fd7225		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00B 11000 bytes
font_02_sfnt_off0000d497.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 16060 bytes
font_03_sfnt_off0000e92f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 4324 bytes

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