Malicious PDF — malware analysis report

Static analysis result for SHA-256 511eab4e0db23b1c…

MALICIOUS

PDF

92.2 KB Created: 2020-08-29 23:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e3eacc0a9ccceca4964c9f9aad6fcd SHA-1: 81b727af234a9d58f9d7ad00d33255bbbeb11750 SHA-256: 511eab4e0db23b1c12beb1d425136f348d8a02e6b92623a4a5dc8b648d3f0c2c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.me/wix?keyword=yazidi+black+book+pdf', is designed to lure users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting an attempt to manipulate search engine results or distribute malicious content broadly. The ML classifier strongly supports the malicious nature of this PDF.

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=yazidi+black+book+pdf
    • https://cdn.shopify.com/s/files/1/0446/5931/0745/files/kannada_old_film_feeling_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/2168/1315/files/duvap.pdf
    • https://cdn.shopify.com/s/files/1/0437/9846/2624/files/74396368525.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85986419962.pdf
    • https://static.usrfiles.com/ugd/b8c837_40d1519768de4423a4f0c07f2cd1766f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c89056227e6f45a3a5d8eed9a9e47951.pdf
    • https://static.usrfiles.com/ugd/b8c837_280c99c108fa45328f68c20215991b70.pdf
    • https://cdn.shopify.com/s/files/1/0431/2973/3282/files/jurnal_pengertian_angiospermae.pdf
    • https://cdn.shopify.com/s/files/1/0435/3615/4773/files/96879159239.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/dipoxunuduminutad.pdf
    • https://cdn.shopify.com/s/files/1/0434/7373/1741/files/bengali_adventure_story_books_free_download.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_off00011fad.bin
cafc71a202c7c4ff077107d50c82ea00d7e84adc288c19b6ea570964d8d5667e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 4576 bytes
font_01_sfnt_off00012f33.bin
63a29e9d18f697bce8ad4d42032809c40212db608d64d95623f1678f86d1af1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 13008 bytes
font_02_sfnt_off00015601.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x15601 4324 bytes