Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76c8efae436b1ff…

MALICIOUS

PDF

38.5 KB Created: 2020-08-18 13:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16ed0526ca42a70f924541f10da254f3 SHA-1: ef49800a9a674016716b4c8b7678fe8bd60b2865 SHA-256: a76c8efae436b1ffbd6cc19fd66ef09198c359dfb2743fe1eadec4fd06ce1daa
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector ('ttraff.ru') that is flagged as malicious, and the document body mentions 'Aida64 extreme full version' suggesting a lure for software downloads. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to attract search engine traffic. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=aida64+extreme+full+version
    • http://dugoxi.accentbottlelights.com/uploads/1/3/2/3/132303195/zelozave-zatubibavolol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3999/7595/files/wabotapejumekape.pdf
    • https://cdn.shopify.com/s/files/1/0435/5614/3265/files/bonopuniwapivumimufat.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/believe_in_yourself_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/agenda_2020_para_imprimir_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/mijipuxenewafagapevugula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0432/6549/1107/files/rcog_guidelines_for_endometrial_polyps.pdf
    • https://cdn.shopify.com/s/files/1/0432/6732/6110/files/telola.pdf
    • https://cdn.shopify.com/s/files/1/0434/8215/3112/files/kalivowiwesoto.pdf
    • https://cdn.shopify.com/s/files/1/0428/6326/3910/files/molew.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005904.bin
678ca60f45d121e048fa91f9422c0934a0a0132ae3292b0f848c17c128de9ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5904 5412 bytes
font_01_sfnt_off00006b60.bin
dd410b7e13580c0a525f03911dfd359a9a9857cb5eed98a40447f25a72db3d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B60 10100 bytes

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