Malicious PDF — malware analysis report

Static analysis result for SHA-256 1279cfc463a9af1d…

MALICIOUS

PDF

44.5 KB Created: 2020-08-07 04:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aca47e86b5bda59b52d0fe91a6547f2 SHA-1: d63a7634aaea0c871eadb510100dcc1da781aab2 SHA-256: 1279cfc463a9af1df14d69063f05c5fa664fe8bda051eb1e9a22a3a5e67b6da8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious by an ML classifier and contains a high number of embedded links, many pointing to external PDFs. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malicious content delivery attempt. The document body contains garbled text and URLs, further supporting 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.cc/pify?keyword=carcinoma+epidermoide+cervix+pdf
    • http://files.ajconsultingcompany.com/uploads/1/3/1/4/131438161/voxezumubebu.pdf
    • http://files.luxefamilyholidays.com/uploads/1/3/1/4/131453031/tamuresoduvuve.pdf
    • http://files.gabesta007.com/uploads/1/3/1/0/131070625/kemigutavufo-poreboxubi-jolej-xezatorabika.pdf
    • http://files.divinelynourishing.com/uploads/1/3/2/7/132741023/643904.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/snell_y_bohlander_administracion_de_recursos_humanos.pdf
    • https://cdn.shopify.com/s/files/1/0431/1000/6940/files/29257385500.pdf
    • https://cdn.shopify.com/s/files/1/0435/6761/2063/files/pevomuxi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4181/4693/files/dugusewixi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/19720224194.pdf
    • https://cdn.shopify.com/s/files/1/0431/9808/7328/files/95794955299.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/78664835945.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/zugipeviwobefegemuki.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/viravisuxepanax.pdf
    • https://cdn.shopify.com/s/files/1/0446/6376/7203/files/honda_v65_magna.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/guzumof.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/web_application_architecture_principles_protocols_and_practices_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/gisezetikoxetoridokuvupo.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_off00007121.bin
8954b4242b1851e6d8a2bea95ee4bba0cf86fa2c5572bfe8bfba2f53f9443fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 5124 bytes
font_01_sfnt_off00008281.bin
50034f467b37e636827f86efcfc59a9f298ea21d2ec7e02baedf9923ab4dc1d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8281 10144 bytes

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