Malicious PDF — malware analysis report

Static analysis result for SHA-256 05356758b07378c6…

MALICIOUS

PDF

40.2 KB Created: 2020-08-12 09:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8278ca57bf8c6da6d6c02fc32c8b39c0 SHA-1: 912eaf18a8e4735da2b7230895867954aff4b47f SHA-256: 05356758b07378c6b4c1fe14f7ea172461d25e6176a740827effddc605425475
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute or obscure malicious content. The document body itself contains garbled text but does include the malicious URL, indicating a likely phishing or malware distribution attempt.

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.com/wb?keyword=alleluia%20randall%20thompson%20pdf
    • http://files.elizabethbaumanart.com/uploads/1/3/1/6/131607063/2685571.pdf
    • http://files.watersideminers.com/uploads/1/3/0/7/130776200/xarubogibat.pdf
    • http://files.therealmommy.com/uploads/1/3/0/7/130739509/duvurezivexofilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/8283/2289/files/fezesajugag.pdf
    • https://cdn.shopify.com/s/files/1/0429/8961/7311/files/71057000104.pdf
    • https://cdn.shopify.com/s/files/1/0430/0334/7097/files/tetizitaraxevatakesogup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/bafg_berlin_antrag.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/clinical_pharmacy_therapeutics.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/91667752751.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/strength_and_conditioning_books.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/77411434340.pdf
    • https://cdn.shopify.com/s/files/1/0431/9513/8208/files/duxadipizivaniwisomidese.pdf
    • https://cdn.shopify.com/s/files/1/0437/4052/8792/files/it_ebooks_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/53217341060.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000519e.bin
b9c64debb659242dce5c5734e166e7b6264476dbf6e8fa6762227e35e960932f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x519E 5152 bytes
font_01_sfnt_off000062e9.bin
b45dc540f53b6582751abaf7ddcc1ead2351c77dd4fa460ddc772cf7fd9c4a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E9 10192 bytes
font_02_sfnt_off000085c4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C4 4324 bytes

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