Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ce5e98f0318278…

MALICIOUS

PDF

42.0 KB Created: 2020-09-02 06:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa070c6f5fc6d412c20640e4994b2a0f SHA-1: 534bf997c616eabbcc9c776fcef760b8703f2821 SHA-256: 73ce5e98f0318278598db3fbec9cf1beb793534347295b2e9001a08d2d234fd6
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to known malicious redirector infrastructure, specifically 'https://ttraff.ru/wix?keyword=candidate+application+form+ddu+gky'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous external PDF links further indicates a link farm or SEO poisoning tactic, designed to attract unsuspecting users.

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=candidate+application+form+ddu+gky
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1f09e834ede14f4287359d0c1aa2bbd8.pdf
    • https://static.usrfiles.com/ugd/a86d68_2d4b13b7b915448ba0b457b3f74ee94d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f859ae14ad842668a2045c447be4da2.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_ed814ea7b10b4c6d8be09739fd13c632.pdf
    • https://static.usrfiles.com/ugd/fa32a6_8b1641a660bc47868c3acacab94627ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_6addfa1903ca4b7481afaf82ee466e43.pdf
    • https://static.usrfiles.com/ugd/868401_e6c3c78f8a9e4bb4921ed739d5d77438.pdf
    • https://static.usrfiles.com/ugd/5c9621_ed9559a6ae0a4e45a770d531cdc073d3.pdf
    • https://static.usrfiles.com/ugd/b444d4_2e8076bc09a749aeb1ca33d9fb30be1f.pdf
    • https://static.usrfiles.com/ugd/e66789_69fb569f2e0f4ccf935edc6897cd4ca2.pdf
    • https://static.usrfiles.com/ugd/5e81b9_3ff3e738528d4e51a3546084ae85aa2d.pdf
    • https://static.usrfiles.com/ugd/d5415a_391c5392ee644c6d89c32931eb7fb5a6.pdf
    • https://cdn.shopify.com/s/files/1/0440/6784/8344/files/boxibokejizakivove.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/nogupet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/47003587169.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5195/files/povulerenoge.pdf
    • https://cdn.shopify.com/s/files/1/0432/2315/4850/files/jujojafalajewivafipikobuz.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_off000065ef.bin
1b80305828512a62b89712854c169556c5430108699d0c0fbc3c1760ff503cd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65EF 5368 bytes
font_01_sfnt_off00007829.bin
cd5b58d4c8af355735056016b32c4f3c7a613d48734e5ca9256dca76ba922cef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7829 10284 bytes

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