Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2503760636c31ef…

MALICIOUS

PDF

45.7 KB Created: 2020-08-30 02:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1cc674f56b8d89b0e24aa7da68f4c7d SHA-1: 6b2c982994d06a88742d7939b5153a7f319cf93c SHA-256: a2503760636c31efcca2558c3d4a632bd0c0a007109362afcb631039649b1dc4
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used to obscure malicious destinations or to create a link farm for SEO poisoning. One of the embedded URLs, 'https://ttraff.club/wix?keyword=journey+of+the+sparrows', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains embedded URLs, reinforcing the 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.club/wix?keyword=journey+of+the+sparrows
    • https://static.usrfiles.com/ugd/d54300_b9053be40b4d4c4c99a93a3115273759.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_58e60d9df1b3477dbe7b3aab41c5cc88.pdf
    • https://static.usrfiles.com/ugd/b8c837_92d19a79efe345d0bc8ffa3f4fb0913e.pdf
    • https://static.usrfiles.com/ugd/191a6d_375c02f313fd45e79f3b9962f82dda83.pdf
    • https://static.usrfiles.com/ugd/b52961_311f0e9dc2c9474cb3d33106b9fa0ed2.pdf
    • https://static.usrfiles.com/ugd/de60da_e42a68567ddd401585fffb3f3a4a09d0.pdf
    • https://static.usrfiles.com/ugd/865d50_01df6b075ccf44ab8e19a6ffee9dfa83.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/tovigol.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/52480634913.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/60070431893.pdf
    • https://cdn.shopify.com/s/files/1/0433/8486/4917/files/roasted_salted_cashew_nuts_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0447/4395/0490/files/adobe_photoshop_7_free_pc.pdf
    • https://static.usrfiles.com/ugd/c0b427_06b14a22047644ae848c5f30b600de1b.pdf
    • https://static.usrfiles.com/ugd/3aee12_7972cb2338614af2b440e9984a28f4ad.pdf
    • https://static.usrfiles.com/ugd/353d00_7dd016259eb642e48160c24b35244e3b.pdf
    • https://static.usrfiles.com/ugd/aff7ca_5f31cb6d2c4d42e3929f3edcb241df8d.pdf
    • https://static.usrfiles.com/ugd/eda9ba_541323888c6444df85dd742e63124156.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_off000067d9.bin
23fe2ea6a1915f8a1db77afd55e650eed836f47a64cdd80d6b79e0bbbb7cdf1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D9 4976 bytes
font_01_sfnt_off000078c9.bin
4b8eb1fde4c28e4dc8dc0948fe00e00bb1c74c356e5eb7aa4cf2e96a4aa7a0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C9 10232 bytes
font_02_sfnt_off00009bd5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD5 4324 bytes

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