Malicious PDF — malware analysis report

Static analysis result for SHA-256 807d1595158d36ae…

MALICIOUS

PDF

33.9 KB Created: 2020-08-18 17:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b9412804ee714786d8709cc9ab130c6 SHA-1: f0246597ac783168f5513413a8e5e5f64d5cc38f SHA-256: 807d1595158d36ae2551de44ffbe0fede67cc8fd924c52b12174622f5cb71694
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a prominent link that redirects to a malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same redirect URL, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector and a link farm points to an attempt to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.com/pify?keyword=usg+sheetrock+acoustical+sealant+submittal
    • http://gupuz.reconcilingcircle.com/uploads/1/3/1/1/131163635/vegupo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/mobile_money_history.pdf
    • https://cdn.shopify.com/s/files/1/0431/6839/9524/files/6367888298.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/zoxamaponazesuwekin.pdf
    • https://cdn.shopify.com/s/files/1/0437/4344/5141/files/29242212026.pdf
    • https://cdn.shopify.com/s/files/1/0430/3798/2869/files/46598320855.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55781022724.pdf
    • https://cdn.shopify.com/s/files/1/0430/3355/9203/files/ambedkar_books_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0429/9482/7415/files/activity_on_node_diagram_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/3087/2215/files/usa_time_zone_map_with_states.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/58228766911.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6887/files/kunizegipibevarowoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/0817/8845/files/82052849889.pdf
    • https://cdn.shopify.com/s/files/1/0440/7640/0792/files/penelapifeseguzefepemi.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_off00004662.bin
dcda8c52a0518ba658b6fc258079d5f6a933add5035c72bb5b4d97d7d13020d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4662 5408 bytes
font_01_sfnt_off000058a0.bin
9551308b666a312449683ea7f95eeba1cfe6796f67daf9fd002d1c9d2494f742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A0 9924 bytes

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