Malicious PDF — malware analysis report

Static analysis result for SHA-256 9820fb7ac4a7e203…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 00:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7e83ec995405e883c49d487bbd977d1 SHA-1: 5ca743d8a13901ecf2a759939e37b88e4814b628 SHA-256: 9820fb7ac4a7e2031bbd1a99ef8b97c184f9eaea1c67cc2860b9f539f422eb80
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 pointing to 'https://ttraff.ru/pify?keyword=nuwave+oven+recipe+book+pdf'. This URL is part of a link farm designed to lure users with search engine optimized content, ultimately redirecting them to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and embedded URLs, reinforcing the malicious intent.

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=nuwave+oven+recipe+book+pdf
    • http://files.robynholland.com.au/uploads/1/3/2/6/132682281/gologikewudasebagu.pdf
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://files.moonflowerwellnessavl.com/uploads/1/3/0/8/130814169/latekanesojo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7696/0924/files/71197707197.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/dark_souls_2_sotfs_cheat_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetitoditasenubekuxon.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/google_chromecast_pictures_locations.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/77777549528.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/sefatadiwit.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/pebetumege.pdf
    • https://cdn.shopify.com/s/files/1/0440/4704/0662/files/48550318794.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/devejituxavonevewubi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/jewulafubevejogirubobufag.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/kowotepujedapesefibox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/2791028813.pdf
    • https://cdn.shopify.com/s/files/1/0435/1541/2632/files/24744008578.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_off00006892.bin
b4c05dcd5a5846a833a61a352b2ec1aa5f149feea75cb221a0b6f24eb845bffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6892 5264 bytes
font_01_sfnt_off00007aa5.bin
b8f6e7aa44984bd25f5d0e1a2524f3ef20ecc572f34680aea8eac8224857f529		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA5 10300 bytes

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