Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b8244dea029ccf…

MALICIOUS

PDF

45.1 KB Created: 2020-09-02 01:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2758c5ecbb6f06454c73aaa03ae97da4 SHA-1: 883987c351356fb0fff8c66ed9efa90347ccee49 SHA-256: 34b8244dea029ccfd064051d504a40f0c49cb1d6456ccca8aba94c89ea62f1d3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment 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.ru/wix?keyword=human+resource+management+report+pdf', is designed to lead users to malicious infrastructure. The document also exhibits characteristics of a PDF link farm, indicating a broader campaign to distribute malicious content.

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=human+resource+management+report+pdf
    • https://static.usrfiles.com/ugd/b8c837_ec46b9046ca94cfe850ab314226bdc4f.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_1a1bb51033c547ac8aef5c508a858f94.pdf
    • https://static.usrfiles.com/ugd/87a178_2120ee1199884d92bb5104e55ae7c082.pdf
    • https://cdn.shopify.com/s/files/1/0464/7039/8110/files/95225818077.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/xekazele.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c5e88d230c347a6a819567be00ac3b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbc1a33656694093b4b3582e9f56fbf5.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/riveberulebutegaduxoxume.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/chef_s_choice_manual_knife_sharpener_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/democratic_leadership_style_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/24832967504.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_off000071cb.bin
45c3a447f4c2f12703ec1c4f2480c30f1afdffa88637a802b1ce5867f2a5e157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CB 5404 bytes
font_01_sfnt_off0000840f.bin
ed4a2bacf585e7e244e612cb0efc20aa75d5b4db4e482b5fae7f4eb832f8b54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840F 10488 bytes

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