Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17f0d66123773b2…

MALICIOUS

PDF

42.1 KB Created: 2020-08-30 02:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4fe086021716e6ebb3b53fb4116f1ea SHA-1: 9f6d6e95a46c311f5e7830a9729a6bc77444c5e0 SHA-256: e17f0d66123773b2c3cd140087d5ac2e5470408d40d34d5e6809d126c4c26c1f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=el+hombre+y+la+cultura+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a broader distribution or SEO poisoning tactic. 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.com/wix?keyword=el+hombre+y+la+cultura+pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/54289849650.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/lowosizozo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/check_list_auditoria_interna_iso_9001_verso_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/autism_spectrum_rating_scale.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8151/files/35585641251.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/84720023069.pdf
    • https://cdn.shopify.com/s/files/1/0447/2664/8985/files/essential_organic_chemistry_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/9690/6659/files/muvotofamasetenun.pdf
    • https://static.usrfiles.com/ugd/45fd81_6da75f915eb943b1a424a496d3945c93.pdf
    • https://static.usrfiles.com/ugd/353d00_483ad5e1f6f04d8bbe1b217b6ea1dabb.pdf
    • https://static.usrfiles.com/ugd/df4650_2ffe31b0d9424a6d8e541a7c344b3dd7.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/evicore_prior_authorization_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/8517/6736/files/durilobonoxadunujulofav.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/79489174788.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/you_and_me_lifehouse.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/vifadifoxow.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_off00006460.bin
23f59013b0fe20b9fa672580232ce9c935422ab8395c5a3f0bf87fb6f5cbb637		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 5416 bytes
font_01_sfnt_off000076aa.bin
555261d9ae1abde8b38ab747e92c5312a27aa6a22644a5247ea2054c59b1c6b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AA 11340 bytes

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