Malicious PDF — malware analysis report

Static analysis result for SHA-256 14d3053386ea5fa5…

MALICIOUS

PDF

65.4 KB Created: 2020-08-09 20:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ecd19abce31169d39dff74ade681560 SHA-1: 72cfc44e2edb366ce3d2fd2dfbc4e98d2490371c SHA-256: 14d3053386ea5fa5e6e9e1960ab97b2e8ec6a6f2995c2d25cd102dc80222c721
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host other PDFs, with one primary link identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a campaign to distribute malicious content or phish users. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a malicious intent to redirect users to harmful sites.

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=aprendizajes+clave+pdf+secundaria+tutoria+y+educacion+socioemocional
    • http://files.bcdoffshore.com/uploads/1/3/1/4/131482878/384e2416e.pdf
    • http://files.discoveration.org/uploads/1/3/0/7/130775249/4296439.pdf
    • http://files.pinetreeglassworks.com/uploads/1/3/1/6/131606072/02a43b.pdf
    • http://files.sleepydogfilmsusa.com/uploads/1/3/0/7/130740068/fa67dc45b.pdf
    • http://files.adelphidsp.com/uploads/1/3/0/8/130873947/xizuke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/sidezom.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/lowaxonosot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58585016777.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/nepesoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/1535/5042/files/mokavewapad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/vivibewexibusikosuvereko.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/wusizodododepivinexewe.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1959/files/37584376201.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/shoo_fly_don_t_bother_me_song.pdf
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/jijitolelasamam.pdf
    • https://cdn.shopify.com/s/files/1/0440/1342/0702/files/manual_para_hacer_aviones_de_papel.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_off0000bc15.bin
de6ecfd01e5a6af9e3b7b6276a2ad98cb7296da11323029e1a97eb9bd77c6ae4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC15 5576 bytes
font_01_sfnt_off0000cf19.bin
71d05ec2475bec57a6428ce786872c11d08b1cec0ae5b7d4bb36165c6cf135fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 11856 bytes

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