Malicious PDF — malware analysis report

Static analysis result for SHA-256 c420a13674870251…

MALICIOUS

PDF

62.0 KB Created: 2020-09-05 03:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 379de2a4d774f13d6880e005ebd30203 SHA-1: d3db796495c957e933f8d18aa7951ec384010c3f SHA-256: c420a136748702517a6fa70b8efcbbe8201f58008df31c6fdddb8c39c08aa387
152 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.me' disguised as a search result for 'Chernobyl episode 1 subtitles', which is a common social engineering tactic to trick users into visiting malicious sites. The PDF also hosts a large number of other PDF files, suggesting a link farm or SEO poisoning attempt. 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.me/wix?keyword=chernobyl+episode+1+subtitles
    • https://static.usrfiles.com/ugd/740d8c_157ed08215f64a2ca91a1f9e53395f8c.pdf
    • https://static.usrfiles.com/ugd/0c4177_c2084bc027bc4e98919e3e5c98bd652c.pdf
    • https://static.usrfiles.com/ugd/81ef4b_0da0c47b9066459081abb2d7064c591b.pdf
    • https://static.usrfiles.com/ugd/6cfc61_349be2d6e6bf4745a39484ed598433db.pdf
    • https://static.usrfiles.com/ugd/f84671_1d7de4dbe75244a7b66b539405f2bec3.pdf
    • https://static.usrfiles.com/ugd/8c0e65_d49077b7c46f4c99b741f45cb52ff5f2.pdf
    • https://static.usrfiles.com/ugd/740d8c_9a3e3520dbde42ff801620b9a1b609e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_59fa1813d14a48b384a6d51b8831d1e2.pdf
    • https://static.usrfiles.com/ugd/a43ec6_c4db22536c524b808462c5c6d95315d7.pdf
    • https://static.usrfiles.com/ugd/b28ae2_6c19c1e36b854b3eb3cb09d6a5e72009.pdf
    • https://static.usrfiles.com/ugd/9edd50_0f9e78615f1540848fae52d039a82bcd.pdf
    • https://cdn.shopify.com/s/files/1/0432/4897/6027/files/factores_psicologicos_en_la_obesidad.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/xipalegojalata.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/xexafarixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9634/files/womazekejoz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/waxosezosibuw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009139.bin
9bc85ea4fe9ae8c2656023dfa754a384cbf2fd40350af2c0789088ee3eb70de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9139 6892 bytes
font_01_sfnt_off0000a846.bin
e5cda1e4fbaaf29bd82083fe52a685255cf50c90db6e2597c97d9c755e796287		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA846 5036 bytes
font_02_sfnt_off0000b95b.bin
1eb1e2e33e2bde3a1ead7c60184337683c914d22ce0409e0407c9669cb02e06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB95B 10204 bytes
font_03_sfnt_off0000dc69.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 4324 bytes

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