Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dfd92f65035af3…

MALICIOUS

PDF

46.1 KB Created: 2020-08-07 05:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c649594186a2f686292c0af79c8d3cf1 SHA-1: 874fa938e3bc8b8fee53fef03d1153b589707f4d SHA-256: 12dfd92f65035af3983f8973aa5d6e3d9c258b1f0434b59bf726d38f382e095f
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'similar triangles theorem pdf' and a URL, suggesting a lure to disguise malicious links. The presence of multiple PDF links, many hosted on Shopify, indicates a link farm likely used for SEO poisoning or distributing further malicious content.

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=similar+triangles+theorem+pdf
    • http://files.keepanopenmind.net/uploads/1/3/0/8/130814642/354913.pdf
    • http://files.brookeboone.com/uploads/1/3/1/4/131452958/b96ef624.pdf
    • http://bunodaxal.gelman308.com/uploads/1/3/1/8/131856772/sovatosa-fovolerozar-gaveba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5189/0341/files/88121551005.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/95035420881.pdf
    • https://cdn.shopify.com/s/files/1/0430/5269/5703/files/gimegapebudarefuripibajow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6151/8231/files/12997564967.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4518/files/buell_blast_500.pdf
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/cardioversion_electrica_y_farmacologica.pdf
    • https://cdn.shopify.com/s/files/1/0437/5291/5098/files/jilodinofirusebak.pdf
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/14028509020.pdf
    • https://cdn.shopify.com/s/files/1/0431/2940/5600/files/26604151213.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85755015361.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/english_file_beginner_3rd_edition_teacher_s_book.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_off00005dd7.bin
aa421dbff420e4fa56b7c2f3610095bbcb0dd7a184587f5c328b4b82c085336d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD7 5560 bytes
font_01_sfnt_off0000708e.bin
116105c19d7f8055c993abe3f0d1d89008faa258237b722e3ddda34470de08df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708E 10804 bytes
font_02_sfnt_off000095ac.bin
6744bc5f1dd29617e11f6b95442a43dc4e42d6c979c2432f6483e38f708f0d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95AC 16328 bytes

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