Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98e0df5b9950c68…

MALICIOUS

PDF

41.0 KB Created: 2020-09-01 08:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b40c6d448365bf7d85678623e15c49 SHA-1: fb9d703765f34b0a13e80513e71960c5db0eb526 SHA-256: d98e0df5b9950c689b916465d00df04020d94fa0953304efaf88dc08c8a341b3
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding numerous URLs that likely serve to manipulate search engine results or obscure malicious destinations. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body was unreadable, but the extensive link farm and redirector URL are sufficient indicators of malicious intent.

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/wix?keyword=extreme+copy+software+free
    • https://cdn.shopify.com/s/files/1/0431/6594/1917/files/25158035353.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/54315149813.pdf
    • https://cdn.shopify.com/s/files/1/0439/0764/5595/files/brothers_day_movie_in_tamilrockers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8035/files/duvuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/gubijobopudaxokimo.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_4e468dabac0743bfb321651b9f8ab531.pdf
    • https://static.usrfiles.com/ugd/02beb7_25294437d4e84813823976d2d61ff853.pdf
    • https://static.usrfiles.com/ugd/9dda13_3838ffb23e134c72a59250a6539406d2.pdf
    • https://static.usrfiles.com/ugd/c75f60_2a9908ce8c0e4a4a812003eac625b604.pdf
    • https://cdn.shopify.com/s/files/1/0432/0883/5234/files/elementos_anfoteros.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/libros_para_aprender_ingles_leyendo.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4907/files/bufalonegedolujedawaviwo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/epilepsy_and_the_functional_anatomy_of_the_human_brain.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/asiana_a330_business_class_trip_report.pdf
    • https://static.usrfiles.com/ugd/b8c837_d59cec74088c4297bda894a3449ecb75.pdf
    • https://static.usrfiles.com/ugd/32acb1_91fd7bd2d1b64e22818ae2454e10fd6c.pdf
    • https://static.usrfiles.com/ugd/87fdc7_4d2c00502cbc42d2b27306080924b41a.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_off00006224.bin
dba7401f8e624f92aeda4853f1e50a695921d9c3066b64687fee51ce5afdc4b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6224 5348 bytes
font_01_sfnt_off00007463.bin
334bb72856f092d3beaf1f1640dfc53c5911d158d675a502d5c811ef698fde0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 10240 bytes

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