Malicious PDF — malware analysis report

Static analysis result for SHA-256 f251d55ccf71d48b…

MALICIOUS

PDF

42.9 KB Created: 2020-08-31 03:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbe39249a8fdca13ad1bc737d69188d6 SHA-1: 7332d8f5e2376cace9661eb356cc0d5a0c715a7c SHA-256: f251d55ccf71d48b2dee91a3eaa654d8ab6b5786a9cf280638df212917a5bfb7
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text related to 'Manual de estructuras ilustrado pdf gratis' and the URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=manual+de+estructuras+ilustrado+pdf+gratis
    • https://static.usrfiles.com/ugd/de60da_2ba7e847ef3f4a39bcf64cbe6c5d16bb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2f640f340c6440aaa326855df987f29.pdf
    • https://static.usrfiles.com/ugd/b8c837_98f4388ee5e94d30af131694b62b071d.pdf
    • https://static.usrfiles.com/ugd/d3758e_71c38b86de5d424b9113b1f6d5771ca4.pdf
    • https://static.usrfiles.com/ugd/0286dd_bd09146ee2024fbb961d85e0ef5d9fa5.pdf
    • https://static.usrfiles.com/ugd/a18aa6_6003e9de7e71420bb4bd590bb91d42f5.pdf
    • https://static.usrfiles.com/ugd/eda9ba_0bf63a7737af40349e9646d30eff0b67.pdf
    • https://static.usrfiles.com/ugd/b8c837_4180453556b74d8f9be19202241c0252.pdf
    • https://static.usrfiles.com/ugd/b8c837_759fa00d1b73406ab04d855dd876ea7d.pdf
    • https://cdn.shopify.com/s/files/1/0437/8374/9781/files/psychology_quotes_about_love.pdf
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/gogazulenunaxez.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/75049373866.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/91880074409.pdf
    • https://static.usrfiles.com/ugd/238140_5f1cb53ea96b4a95b227f6d76a785b8c.pdf
    • https://static.usrfiles.com/ugd/edb4a7_003cdcf072924cb0a61a65bd5f71ec7b.pdf
    • https://static.usrfiles.com/ugd/9374a7_e24afcca12ca4b1ca917dab99d64ae3a.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_off000066a3.bin
e453969ccf3e9f9f4368c523c6322db0086a4f7c7329788022ebbf82eece2143
pdf-font-stream PDF embedded font (sfnt) at offset 0x66A3 5328 bytes
font_01_sfnt_off000078ce.bin
5acb413574c9d617bc402b6e80a3d3e4e002182808546c33b701b4328f668163
pdf-font-stream PDF embedded font (sfnt) at offset 0x78CE 11208 bytes