Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2c62773815da52…

MALICIOUS

PDF

48.1 KB Created: 2020-08-26 22:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e97deb3717d41ea1795215d04127fb1 SHA-1: 714acb62b53684fce76c77871fbf040877ad61b3 SHA-256: 5d2c62773815da52d8be1cadddad6e92067d03af64390dbf72dbbf9ec0c788ab
154 Risk Score

Malware Insights

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

The sample is a PDF that contains a large number of embedded links, many of which point to external resources, indicating a link farm or SEO manipulation tactic. One of the primary URLs, 'https://ttraff.com/pify?keyword=vim+cheat+sheet+pdf+one+page', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links suggests an attempt to drive traffic to malicious infrastructure.

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.com/pify?keyword=vim+cheat+sheet+pdf+one+page
    • http://ritikemef.renee-fine-art.com/uploads/1/3/1/0/131070374/ce37f9.pdf
    • http://files.janetruth.com/uploads/1/3/2/3/132302992/4452078.pdf
    • http://files.marytherapeuticmassagenb.com/uploads/1/3/2/6/132682171/5d0758.pdf
    • http://files.mjglobalcommunications.com/uploads/1/3/2/7/132712011/narikibovovogibog.pdf
    • http://files.ecopacificinsulators.com/uploads/1/3/1/4/131407406/tenulebi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3710/6087/files/adding_fractions_rules.pdf
    • https://cdn.shopify.com/s/files/1/0440/0647/3886/files/sowet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/43161737128.pdf
    • https://cdn.shopify.com/s/files/1/0432/4252/0739/files/24329913268.pdf
    • https://cdn.shopify.com/s/files/1/0433/9826/7029/files/powerpoint_presentation_templates_nature.pdf
    • https://cdn.shopify.com/s/files/1/0432/8030/2244/files/ronulexa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/powevaligerodirikep.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/87230604770.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/31786235390.pdf
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/multiplying_polynomials_worksheet_coloring_activity.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_off000070b2.bin
6f7b1945f54e35e8744ae6fc7d33442da649ef4e9a20a9f92d52a45fc240a66c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B2 5404 bytes
font_01_sfnt_off000082f7.bin
ae7ff6b06fad62dc891295b59c35f3f6cc0979984812e65aab146a4dc295fbab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F7 15496 bytes

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