Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b98250b5a51a1dc…

MALICIOUS

PDF

45.2 KB Created: 2020-08-29 03:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d307bcf30f3128066299f8a8214a9282 SHA-1: 6c3d96444acd90028ab07465029976a54199b656 SHA-256: 9b98250b5a51a1dcd4fd5267e80e8ea3c1ad1fe0e629385272fb193360868c32
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector at 'https://ttraff.com/wix?keyword=gasosa+quatro+rodas'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. 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.com/wix?keyword=gasosa+quatro+rodas
    • https://static.usrfiles.com/ugd/b8c837_4c9e523034c3444dafbdfb705f38b5ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_55c95d7425094209b1bd0b0057209363.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad9832d2efd24c09924b5cce1a436411.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f4278d71d22471597b283dbeea6eddd.pdf
    • https://static.usrfiles.com/ugd/b8c837_45196fe3485d4e7aa8fe48fa926bbd1e.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/pagajoven.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/nalufalebopuwejuzutes.pdf
    • https://cdn.shopify.com/s/files/1/0428/1732/3175/files/acadmie_franaise_dictionnaire.pdf
    • https://static.usrfiles.com/ugd/b8c837_5081172ece1e4796955af9159a41e5d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d022d14d9856478c8843aa2368136461.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7bd322d462846029e28b47c62fb6ed6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f4427a72ee54ff1ae66f07e83c5cc71.pdf
    • https://cdn.shopify.com/s/files/1/0440/8279/0552/files/56289805484.pdf
    • https://cdn.shopify.com/s/files/1/0429/9898/8949/files/fotateruf.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/jefemizanenoxewolegu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/nupanolizunuwubemosekubil.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_off000070b8.bin
0cc9ad1fc474344f287e6724239dee74f5a30d12214c8b08639aaa0ba1785406
pdf-font-stream PDF embedded font (sfnt) at offset 0x70B8 4944 bytes
font_01_sfnt_off00008197.bin
2f1f10a343e223cded436c8e71744c718edfb65d9455dc0e707c9728bccaeb6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8197 12732 bytes