Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9092be561b15cf6…

MALICIOUS

PDF

34.7 KB Created: 2020-09-06 01:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faef7cb99877aacfc50b252434300247 SHA-1: 641d3beb3dd62065901d2863579b0ffc7110b796 SHA-256: b9092be561b15cf6ce340ba8147c203fea4e311547e16a98cafce81981956421
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, which is used to lure victims with promises of free movie access. The document body, though heavily obfuscated, contains the same lure text and the malicious URL. The presence of a large number of embedded links, many pointing to benign content hosting sites, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector. No scripts were extracted from this sample.

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.me/wix?keyword=basic+instinct+1992+full+movie+free
    • https://static.usrfiles.com/ugd/b8c837_1151f941a10c448694d147db5a53ce12.pdf
    • https://static.usrfiles.com/ugd/b8c837_0d679de417aa405f91780757c8d963ec.pdf
    • https://static.usrfiles.com/ugd/0a84ca_0595f3555bf9491f90ae217cff17501e.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/44748815636.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9515/5105/files/9481507180.pdf
    • https://cdn.shopify.com/s/files/1/0430/8303/8874/files/etica_en_las_instituciones.pdf
    • https://static.usrfiles.com/ugd/74c34a_d9032aa752d14ecbb67e34f08bc18993.pdf
    • https://static.usrfiles.com/ugd/17beed_63c6266b0ccd4493bf2314840e95e91b.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_15212a83cf34480b9669291bc6dab67e.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_off0000485e.bin
107ed9f2c3505dbffd19bd131a7c1c4425e910fc3462bcd7f90843bda644653a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x485E 5476 bytes
font_01_sfnt_off00005af5.bin
17d59a65a95771695d56650efa5a7a9c07dd625268f1e9213955073f8c5ab5a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF5 10340 bytes

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