Malicious PDF — malware analysis report

Static analysis result for SHA-256 8292e36e2ccd49b1…

MALICIOUS

PDF

44.3 KB Created: 2020-08-14 05:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d559fcaaf9c8d85952ea21830c6499 SHA-1: 7a645f31f0d525734123bda0bdfa2e23abffcf9a SHA-256: 8292e36e2ccd49b1a61b683b7bce4383c4c18dd4b7fca74d8d8cb0ddd1a70e84
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms and redirectors. The primary malicious URL identified is 'https://ttraff.ru/pify?keyword=mahalaxmi+calendar+april+2019+pdf+free', which appears to be part of a scheme to lure users into clicking on further links. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a coordinated effort to distribute malicious links under the guise of search results.

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=mahalaxmi+calendar+april+2019+pdf+free
    • http://xusiw.mutchlerproperties.com/uploads/1/3/1/0/131070874/migil.pdf
    • http://files.mentorsmatter.us/uploads/1/3/1/1/131164479/f8f738384.pdf
    • http://files.nmwordprocessing.com/uploads/1/3/0/8/130874252/xapeminofafaf-vuxijoninis-kejetopo.pdf
    • http://files.stonehedge.us/uploads/1/3/2/3/132303041/48518f95f59f.pdf
    • http://files.uvoholicsanonymous.com/uploads/1/3/0/8/130874633/zejobujimikevogula.pdf
    • https://cdn.shopify.com/s/files/1/0435/8055/5419/files/naripokaxupuvuxojububoja.pdf
    • https://cdn.shopify.com/s/files/1/0437/6628/4446/files/72299796548.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/84648542776.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/56445891455.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/59753790324.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/thesis_on_agricultural_extension_and_rural_development.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vofekofunore.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/vascular_anatomy_of_the_brain.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/36020381053.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/68962331385.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/30328886626.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_off00005006.bin
434c6deaf91c17bd20ed3d679d5aa3f07508facb8ca16ae904f8dac6b9957d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5006 5772 bytes
font_01_sfnt_off0000638c.bin
3b5726b127cfacde1c3aabd16290edc680afce53034f9e805bb6aa9b81ecb1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638C 9648 bytes
font_02_sfnt_off000084cb.bin
c4caa31faf06bc736c2771c2a9bde31376524606673c5bfa9ece6bed036244ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CB 9268 bytes

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