Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4974c1df10f4d67…

MALICIOUS

PDF

35.2 KB Created: 2020-08-04 10:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff3b163cd27a1a65af3efc9a37282598 SHA-1: 6e264288b68f46d8c69a29ced81641a8fdd71a55 SHA-256: a4974c1df10f4d67d34c7d94ab346478f60d006c9bb8f487959af25c36de9030
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a PDF_SEO_LINK_FARM. Another heuristic, PDF_MALICIOUS_REDIRECTOR_LINK, flags a link pointing to 'ttraff.ru', indicating it leads to malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=acca+f3+study+notes+pdf', suggesting a lure related to study notes to entice users to click the malicious link.

Heuristics 3

  • 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.
  • 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=acca+f3+study+notes+pdf
    • http://files.letterstoimani.org/uploads/1/3/0/7/130775115/visoma-vesoweki.pdf
    • http://files.happiestwives.com/uploads/1/3/1/4/131408798/subazidezifox_riratukiwejofe.pdf
    • http://files.banginhardfireworks.com/uploads/1/3/0/8/130813317/xuxoziwuk.pdf
    • http://files.indianhockeyskills.com/uploads/1/3/0/8/130873921/c815e6b0.pdf
    • https://cdn.shopify.com/s/files/1/0431/0843/4077/files/mebemoradaxedemupiziw.pdf
    • https://cdn.shopify.com/s/files/1/0433/9885/6871/files/65026183963.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/40068703505.pdf
    • https://cdn.shopify.com/s/files/1/0436/9140/9562/files/20750348418.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/44672608727.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/66740647074.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/demorimoluxoromege.pdf
    • https://cdn.shopify.com/s/files/1/0436/1358/5566/files/50734475810.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/gupowufap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1828/8285/files/7754963454.pdf
    • https://cdn.shopify.com/s/files/1/0430/3182/2485/files/8485970663.pdf
    • https://cdn.shopify.com/s/files/1/0434/3070/7356/files/daxiwikoso.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/goviduzejigasiwaz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004caa.bin
297c794e1f9bf6e3cbc3654f56d3f789f366e9c59fe54f05b26acc2f7bcf94bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CAA 5276 bytes
font_01_sfnt_off00005ec3.bin
28831a6514981771728d24e4836465669300cbf0ee5adf5e09f14ec0f7588547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EC3 9632 bytes

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