Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50d4adc53c9cfd7…

MALICIOUS

PDF

44.2 KB Created: 2020-09-03 17:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e24239627dc29e061d0115e3b9e0280f SHA-1: 8f2d479b3d65b1d1a416c342c9419c8525372102 SHA-256: e50d4adc53c9cfd7ac6e2c5d0f68e992b298ea00979219e1b0e37afd4c8be1a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a lure related to a 'medical certificate format for job leave' and embeds multiple links. One of these links, 'https://ttraff.club/wix?keyword=medical+certificate+format+for+job+leave', is identified as a malicious redirector. The PDF also contains a link farm, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. 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.club/wix?keyword=medical+certificate+format+for+job+leave
    • https://cdn.shopify.com/s/files/1/0435/4713/2068/files/62988056476.pdf
    • https://cdn.shopify.com/s/files/1/0436/8603/5621/files/losojavafif.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/assemblies_of_god_statement_of_faith.pdf
    • https://cdn.shopify.com/s/files/1/0429/5426/0643/files/brunei_travel_guide.pdf
    • https://static.usrfiles.com/ugd/6f5f23_d778c5bae2c84e93a41ad0a3135dfcce.pdf
    • https://static.usrfiles.com/ugd/74e9cf_de6f00f7f3844551be411c5987255a07.pdf
    • https://static.usrfiles.com/ugd/34e21e_d19880ab4e1040c9bd7a189fa5f49943.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbdc4d9df8e143d49364559de6ee72a1.pdf
    • https://static.usrfiles.com/ugd/f6a907_e24fb759f4614c0583c10e69c5674025.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/muxaxadini.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/talurakafonexuwux.pdf
    • https://cdn.shopify.com/s/files/1/0448/2108/6365/files/iphone_app_store_apk_for_android.pdf
    • https://static.usrfiles.com/ugd/efc97f_6aade126054541899eb3aa22e536f459.pdf
    • https://static.usrfiles.com/ugd/c12414_758721a2d54d4e31906ca42c6ac4cba1.pdf
    • https://static.usrfiles.com/ugd/cc03df_fa02d732b1834483ad3b38d6aa71a877.pdf
    • https://static.usrfiles.com/ugd/868401_324c4992c76b4b29825c1381bae635b7.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_off0000632e.bin
9dbde696ed972b552ecdd9b4cf9ad713ee6a51f95b648278aa15cb8dee449e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 4952 bytes
font_01_sfnt_off0000740e.bin
2edf35930bf4aebcdfc699d14572af53a9dd66508d5633213715314ae5394b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 9748 bytes
font_02_sfnt_off00009559.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9559 4324 bytes

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