Malicious PDF — malware analysis report

Static analysis result for SHA-256 5158e1a8ce379706…

MALICIOUS

PDF

39.0 KB Created: 2020-08-30 13:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 227270dca0bfae7b59dbbdda7575127a SHA-1: 981ba6cb0041ba949f2aac71cb8eb8c012dd6777 SHA-256: 5158e1a8ce3797061f5f3b8196c26412f0b121927abe74a1c009f31817a7c7a4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=guia+de+supervivencia+zombie+pdf+descargar+gratis'. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a 'zombie survival guide'. The presence of numerous other links, many benign, suggests a link farm or SEO poisoning attempt to mask the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=guia+de+supervivencia+zombie+pdf+descargar+gratis
    • https://static.usrfiles.com/ugd/b8c837_1c52407394504aaeba3a17284267aed0.pdf
    • https://static.usrfiles.com/ugd/e3834b_16aea6b9e93a4baebf2914425f518cd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f535ef80b684449da6f47851167064a5.pdf
    • https://static.usrfiles.com/ugd/f84671_d0e9273ead394988918f899eb37972ae.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/zoology_objective_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/3323/9457/files/53753420876.pdf
    • https://cdn.shopify.com/s/files/1/0446/6461/9161/files/cambridge_dictionary_english_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/xetinemovenetiwesinawaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/11696196130.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_e3aa1e3620b3495fa5a2af5d52c9ac21.pdf
    • https://static.usrfiles.com/ugd/b8c837_aea8e53dc91445bc9d722d7427837de9.pdf
    • https://static.usrfiles.com/ugd/79e0dc_30068e1b65c6402287360fef1adbab96.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_e3d20aaa65224e799c6309a08c35e42a.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/fadekikisuzorulo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/wikowobiwususolit.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/xovirajuxidesu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/diwazukijefevogoburipokow.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_off00005379.bin
2f97879b132121606c89b47f17e9450239899ed5e4cc883b34ed022be70da22c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5379 5724 bytes
font_01_sfnt_off000066ef.bin
98ce87a4679f251b951cc94b68527dc225f017910e70c9c5b2f1dd74e1c4b09d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EF 11516 bytes

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