Malicious PDF — malware analysis report

Static analysis result for SHA-256 405fb80e6c554e31…

MALICIOUS

PDF

48.7 KB Created: 2020-08-08 06:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cca8ae5ad56e516526089294b14ebfd6 SHA-1: c24fc084ec5b988ae6495d7effabedfc877628c4 SHA-256: 405fb80e6c554e310027d0a2e1d0cf88d973fce1b67d5e07577a857865873d1e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to Shopify domains, forming a link farm. One prominent link, 'https://ttraff.ru/pify?keyword=angles+of+depression+and+elevation+worksheet+answers+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=angles+of+depression+and+elevation+worksheet+answers+pdf
    • http://files.glamourgirlhandbags.com/uploads/1/3/1/3/131384401/c76d3ad.pdf
    • http://files.kilmerschool.org/uploads/1/3/2/6/132681452/lifomuputi.pdf
    • http://files.stmattsschoolcampbellsport.com/uploads/1/3/0/9/130969923/vemozutozapozesabaku.pdf
    • http://files.mrbaskwill.com/uploads/1/3/2/6/132683330/b7835a20645.pdf
    • http://files.hubbardlakegolfshop.com/uploads/1/3/0/7/130739974/wakufivonapotadejop.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7665/files/3951519715.pdf
    • https://cdn.shopify.com/s/files/1/0440/2121/9493/files/551158932.pdf
    • https://cdn.shopify.com/s/files/1/0433/7329/7814/files/kepopepafumibogixifof.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/pebutozama.pdf
    • https://cdn.shopify.com/s/files/1/0434/4299/5352/files/patifirekugofunipisipit.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/lakanurepubigemakofu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1183/files/73598134095.pdf
    • https://cdn.shopify.com/s/files/1/0435/7039/7339/files/94311014038.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99839510681.pdf
    • https://cdn.shopify.com/s/files/1/0437/6241/7825/files/wafakakopefujupulumokepo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8423/4398/files/16729402498.pdf
    • https://cdn.shopify.com/s/files/1/0431/0119/2352/files/poxelezowifitada.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3080/files/71281852240.pdf
    • https://cdn.shopify.com/s/files/1/0434/3024/8600/files/irrigation_engineering_multiple_choice_questions.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a08.bin
64a9bb2203913d528792fac55ac9406ec06c738045950ff5c498e4015e57c606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A08 5508 bytes
font_01_sfnt_off00007cde.bin
4b5dad342b6746981dde559195a5a08e93415785caf36e4edeb9ff7e29dc7818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDE 10096 bytes
font_02_sfnt_off00009f1b.bin
b91503074cdd9764477c3fa0a8703da97cbbafbaa588a6b7b62ba86e8f09d30c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1B 16192 bytes

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