Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4be4c5dbaaaa6bc…

MALICIOUS

PDF

38.2 KB Created: 2020-08-30 14:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ff141f7a6a8f6f6ba71faea4cfac584 SHA-1: 6ce7421809f8bb9e71c9a6e98af69d5471579d88 SHA-256: d4be4c5dbaaaa6bc110e29c0510657d38b83bbf21687bc76912b3e2da6a371bb
152 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 ttraff.ru. The document body, though heavily obfuscated, contains text related to video downloads and the malicious URL. The PDF also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on shopify.com. The ML classifier 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=konji+pesida+venaam+video+song+download+hd
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/sezulevinaxini.pdf
    • https://cdn.shopify.com/s/files/1/0430/1373/4563/files/33510904918.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/diwipexobusemugubemuzewum.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/rusajutoxojazaramujevov.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/28844399001.pdf
    • https://static.usrfiles.com/ugd/de65f7_4cf7309de43b4b728196ec91ee13ab80.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ea319eff5db48a3b0b40251a6ba6f08.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bee09a4693b4a918a656957d88435fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_2fc8fa00ffa9422d9573937e99067c4f.pdf
    • https://cdn.shopify.com/s/files/1/0434/2356/3925/files/82109990066.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/18248195117.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/don_t_breathe_vodlocker.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/tamenelevogekonevezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4038/2882/files/dovisolaxukamupisapefub.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_057399472b5c46ccb127b4149d566e32.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce2eb99890cb4ec88b7d458bb6da8de4.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_off00004a2a.bin
efa4393f38fe9719b6b78bb19e3f7aab36a375a5a0942c0d0a949cc48c0cf189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A2A 5184 bytes
font_01_sfnt_off00005bb9.bin
337d739d22d9645efe804fafd925471e98475bc834391ade7f37ed859d951cf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB9 9844 bytes
font_02_sfnt_off00007d77.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D77 4324 bytes

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