Malicious PDF — malware analysis report

Static analysis result for SHA-256 1499c7937cc91005…

MALICIOUS

PDF

43.5 KB Created: 2020-08-05 08:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2700ed30438ab9141e6aa4bf35c8cb3 SHA-1: 19581456e17a581fee60eee531061daefac53fd1 SHA-256: 1499c7937cc91005181d7c9651841f8a33ece086843d2434bc6e7b9626968bb0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. The primary link, 'https://ttraff.ru/pify?keyword=11+human+body+systems+and+their+functions+pdf', is identified as a malicious redirector. The document's structure suggests an attempt to create a link farm or to obscure malicious activity through a large volume of seemingly innocuous links.

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=11+human+body+systems+and+their+functions+pdf
    • http://files.suitsswagger.com/uploads/1/3/1/4/131453560/4078706.pdf
    • http://files.the-nmo.com/uploads/1/3/2/7/132711961/towasovuzatase-medunal-vasavunex.pdf
    • http://files.firstchoicefacilitation.ca/uploads/1/3/0/7/130776275/eb3e0dc4.pdf
    • http://files.quailhoney.com/uploads/1/3/0/7/130775310/rojazixu_wamogosa_jekipa_wubupukopojofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2987/2292/files/81865566071.pdf
    • https://cdn.shopify.com/s/files/1/0437/7729/4498/files/55591662832.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/66890626665.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/fofesafesufiji.pdf
    • https://cdn.shopify.com/s/files/1/0431/5080/3099/files/kovijalikilozobureda.pdf
    • https://cdn.shopify.com/s/files/1/0427/6859/7158/files/tumaropasumoralexinak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/20113965453.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/71778700913.pdf
    • https://cdn.shopify.com/s/files/1/0434/5144/9496/files/4539693675.pdf
    • https://cdn.shopify.com/s/files/1/0438/1478/1085/files/wedding_dash_free_game.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/command_prompt_commands_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0437/8427/4081/files/92646036971.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_off00006afb.bin
9262842cfc08eb63ee032211c480b38e9b15f6b4754a5da86a1cc956750a2f2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 5560 bytes
font_01_sfnt_off00007dbf.bin
b0194c4392299734e97961f9682fff74c9e220117ffbf3416ad592c894459adf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBF 10224 bytes

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