Malicious PDF — malware analysis report

Static analysis result for SHA-256 3414376c9df01cf4…

MALICIOUS

PDF

40.0 KB Created: 2020-09-02 23:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79ce54e0f55f8785614d65d463971c72 SHA-1: e5831cc9719df2ddbb3ecd99aa26d3138a10566d SHA-256: 3414376c9df01cf491d4eb83c799c5c561fc3bbed778a48f6e1206c4837f2fd7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that lead to a redirector hosted on 'ttraff.club', which is flagged as malicious. The document body and embedded links suggest a lure related to 'auto call recorder android apps', likely a phishing or scam attempt. The presence of numerous external links, many pointing to PDF files, indicates a link farm strategy, potentially for SEO manipulation or to distribute further malicious content.

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=auto+call+recorder+android+apps
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/25c42e_4bb5624d73e640cf8a9b8098aed5e1e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b19415cbbbb84587b00bd428bcd33622.pdf
    • https://static.usrfiles.com/ugd/37428b_20caea80afbd405283111f77556737f5.pdf
    • https://static.usrfiles.com/ugd/724bd4_52b7b92f28ff45a497cfc6477cc19dcc.pdf
    • https://cdn.shopify.com/s/files/1/0448/1161/6418/files/irs_pub_915.pdf
    • https://static.usrfiles.com/ugd/e2f197_ce6ce637119c464cbfeff085f49b3c00.pdf
    • https://static.usrfiles.com/ugd/b8c837_1378105b1452451aa90b44311c904eac.pdf
    • https://cdn.shopify.com/s/files/1/0463/4551/9261/files/trane_error_code_126.pdf
    • https://cdn.shopify.com/s/files/1/0435/7960/5147/files/chapter_25_manicuring_study_guide_answers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f41.bin
2d5b008cd034e5a800d41640dd95096099cc990c8b9fba9a6a3fed121832e18b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F41 5056 bytes
font_01_sfnt_off0000707c.bin
3956a3d3a671cceab695d0bd91916789a41e3f8193eb9c3982e51f25584b52b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707C 10300 bytes

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