Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ac97c3812ca956…

MALICIOUS

PDF

48.2 KB Created: 2020-08-29 09:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c671d4096e269ca212bd9b1be8c0aa2b SHA-1: 37898bffa89852dc46a6daa5a6a75fca9c366e02 SHA-256: a3ac97c3812ca956f9a8ad547b56b478da1315d6a0c65178e5ea32a1e0138555
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic identifying one link pointing to a known malicious redirector at 'https://ttraff.ru/wix?keyword=internal+storage+android'. The document body, though heavily obfuscated, also contains this URL and other links to external PDFs hosted on static.usrfiles.com. This suggests a link farm or redirection attack designed to lead users to malicious websites or further payloads.

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=internal+storage+android
    • https://static.usrfiles.com/ugd/b8c837_6058219135d1484896c822688aac2bcc.pdf
    • https://static.usrfiles.com/ugd/b8c837_add80f69af7b45b2aad35d6e86247471.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abedf76d50e44fa9d421f8f6bf31cf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc29d997332d4c2399494376c25d3128.pdf
    • https://static.usrfiles.com/ugd/b8c837_6797cc100474482bbaf7bc7ea767e960.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7130/files/47013765410.pdf
    • https://cdn.shopify.com/s/files/1/0429/2093/5590/files/algebra_formulas_9th_class.pdf
    • https://cdn.shopify.com/s/files/1/0466/7808/1701/files/remoja.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/48240269453.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/biserenuxofofitegefaxoxex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44484222312.pdf
    • https://cdn.shopify.com/s/files/1/0430/9558/9013/files/6311871197.pdf
    • https://static.usrfiles.com/ugd/b8c837_75215d55ffe24d41beb6b5705f61ffa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_e71e2132e20b4d69be56b8fe8620941c.pdf
    • https://static.usrfiles.com/ugd/b8c837_48d0c2cd87754051ac4d44c3b5f94f37.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007360.bin
99a8d74c66426f9cefa7dd331a600596e1aa026da4f55739d827f750e7aab1b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7360 4720 bytes
font_01_sfnt_off00008360.bin
859d65d00dff5792e1d2767b66938ed6d495e4216de46bd387418f19dd508f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8360 10192 bytes
font_02_sfnt_off0000a611.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA611 4324 bytes

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