Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be04c24725ea51e…

MALICIOUS

PDF

41.3 KB Created: 2020-08-15 12:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fee93c8f297a2437dc1c2eb38029d99 SHA-1: 2c1a0e2dd4291b6838433cc283d7d4a87314977e SHA-256: 6be04c24725ea51e338ebb5c162fee5d493ca4dae8d11ae974e0abf8698b91f6
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure for a browser extension or update installation, combined with a visual download button, indicating a social engineering attempt. It also links to a known malicious redirector, suggesting the intent is to lead the user to download a malicious payload disguised as a converter. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wb?keyword=pdf%20to%20excel%20converter%20offline%20download
    • http://files.kamelicounselling.com/uploads/1/3/0/7/130776476/da6162686.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/64956704404.pdf
    • https://cdn.shopify.com/s/files/1/0428/0388/8287/files/kakaotalk_download_mac.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/kalunavebabu.pdf
    • https://cdn.shopify.com/s/files/1/0453/8662/9288/files/22198471772.pdf
    • https://cdn.shopify.com/s/files/1/0440/5359/4277/files/how_to_find_canonical_form_of_pde.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6982/files/the_taste_of_ink.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/botejonowebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4922/2298/files/naming_acids_and_bases_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/paxovubivaseretuvagede.pdf
    • https://cdn.shopify.com/s/files/1/0428/0100/4707/files/rusowoxunekozolix.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/environmental_impact_assessment.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/632816095.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a7.bin
727085f1b9041f435d08b2e8e779f4e181a9758d14bbe0282433652013fc8d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A7 5056 bytes
font_01_sfnt_off000075fd.bin
0a0896b39bb07b90f7a026184cd6345a77a6766064e90d860701cf25656af04b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FD 10008 bytes

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