Malicious PDF — malware analysis report

Static analysis result for SHA-256 849dc2240042d8b3…

MALICIOUS

PDF

47.3 KB Created: 2020-08-07 01:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c65d06600935adfc6d77b6c40b535e9d SHA-1: 82ee335a933978f112770898b18c71feed305b43 SHA-256: 849dc2240042d8b391a2c591dd288d75405907b23914e68e5ccf06c1a17e9789
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. Another heuristic indicates a link farm, suggesting an attempt to generate traffic or distribute content. The presence of a 'download button' lure further supports a malicious intent to redirect the user. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a redirection-based attack.

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.ru/pify?keyword=basic+civil+engineering+bhavikatti+pdf
    • http://files.bryantcyr.com/uploads/1/3/1/4/131437061/6721342.pdf
    • http://raxozoxo.al-shields.com/uploads/1/3/1/1/131164250/kejojujunaragil-jeveperiv-desugigilotobep-jamokit.pdf
    • http://files.azpetscan.com/uploads/1/3/1/4/131407106/tuwon_wenenilofen_jerogopibir_jigemefavumex.pdf
    • http://files.aliceannephotography.com/uploads/1/3/1/3/131379447/xisejexopore.pdf
    • http://files.warrensburgheritagetrail.org/uploads/1/3/0/7/130775320/pisatafixapeviw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4456/0281/files/lamumajujolazaxalugewe.pdf
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/6867265587.pdf
    • https://cdn.shopify.com/s/files/1/0435/4070/9527/files/makajonukoboramuwejokide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4171/files/82394882046.pdf
    • https://cdn.shopify.com/s/files/1/0434/2949/4936/files/sinugak.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/75666490898.pdf
    • https://cdn.shopify.com/s/files/1/0432/1126/0062/files/98264201698.pdf
    • https://cdn.shopify.com/s/files/1/0434/4895/9141/files/sebinadafogago.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/vureguvojadut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9676/8661/files/69660348660.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed9.bin
727fa37f3ecea3add2f275635fc06154a5d7b065df13be7e18643c3881bf6067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED9 5728 bytes
font_01_sfnt_off00007254.bin
b1f2e80c92fc1c3357a5a6c4de599b6813e90f98eb57e78054da62c865e3a753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7254 10468 bytes
font_02_sfnt_off00009655.bin
6084c565405e33d6146fb6b5846a0fa9dea45a65c169dcba9a26cc76509397ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9655 17436 bytes

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