Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bccab0958347e3a…

MALICIOUS

PDF

43.5 KB Created: 2020-09-01 20:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 205fa57ca90bad88420b4384832dd0e2 SHA-1: ae2bc0fcd6d64486363cc649200daa8a30210caf SHA-256: 8bccab0958347e3a362b3f3a89cfddcf8205985e4c79b144e7de34f800245d54
154 Risk Score

Malware Insights

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

The PDF contains a prominent link to 'ttraff.cc' which is flagged as a malicious redirector, likely serving as a lure for users to download the Vidmate APK. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, many hosted on Shopify and static.usrfiles.com. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection and potentially unwanted software distribution.

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.cc/wix?keyword=vidmate+free++apk+for+android
    • https://cdn.shopify.com/s/files/1/0437/0789/1863/files/wedomigiwusiwovuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/split_into_pages_adobe_acrobat.pdf
    • https://cdn.shopify.com/s/files/1/0433/5638/9528/files/79279229746.pdf
    • https://cdn.shopify.com/s/files/1/0431/1701/9292/files/2111803187.pdf
    • https://cdn.shopify.com/s/files/1/0431/7229/8913/files/momogufod.pdf
    • https://static.usrfiles.com/ugd/b8c837_483394ee66ae42fe82a0d3b3a35fe1b5.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_e11c36f85f1f4e5d81e67c3ce5f20ca8.pdf
    • https://static.usrfiles.com/ugd/b8c837_74d49489ccae40119cda99f384d04bb7.pdf
    • https://static.usrfiles.com/ugd/d01287_73424d82079b49afa6e4cb5c96e078ce.pdf
    • https://static.usrfiles.com/ugd/76156b_bb34de89cd21404fb4b13c72ae012595.pdf
    • https://static.usrfiles.com/ugd/4aae87_d72b83ccf0a7480aa8704beaea797c19.pdf
    • https://static.usrfiles.com/ugd/6290de_95af9bed08c14d2ab89894886dd9d6e0.pdf
    • https://static.usrfiles.com/ugd/6116da_25f8bdfab081472b9b587154e42df24b.pdf
    • https://static.usrfiles.com/ugd/b8c837_6089b2989afa43249875c1a84d36af5a.pdf
    • https://static.usrfiles.com/ugd/5e81b9_b0969cc59d0d42dcaa4643bbd76dd261.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_off00006266.bin
cb9072f881c1fe0ad8900bbcc5a20a23fabb306412f64e001cac76c2a9509f2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6266 2952 bytes
font_01_sfnt_off00006cf5.bin
afd80602b261ab5aee3c330d44c253a3797ff1b9c6094947f9b6fd2efdc97e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF5 5004 bytes
font_02_sfnt_off00007deb.bin
22103fdd21f8fae1158c2d64a8c48e04c2c801af8647db3a31613809af3138ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 10288 bytes

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