Malicious PDF — malware analysis report

Static analysis result for SHA-256 c780e9044c802771…

MALICIOUS

PDF

41.1 KB Created: 2020-08-30 12:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db98aa5ecd5927625030f7e6f3e81c56 SHA-1: da72b3d1d0dc3e49ae3ae01598a4769f230fa137 SHA-256: c780e9044c802771cd7fe7fda05ac18042e34fc1d8497bd95b46899d41870d06
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The document body contains a URL pointing to a known malicious redirector, and numerous other links to Shopify domains, many of which are likely part of a link farm designed to obscure the true destination. 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.link/wix?keyword=839+angel+number
    • https://cdn.shopify.com/s/files/1/0430/8638/1207/files/superman_logo_fonts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9062/files/77067954675.pdf
    • https://cdn.shopify.com/s/files/1/0431/1865/7697/files/tejogijenamidufonexi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0804/9830/files/tinogamififojekejaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/7020/1760/files/osrs_ranging_cape.pdf
    • https://cdn.shopify.com/s/files/1/0438/7281/3211/files/learning_javascript_design_patterns_addy_osmani.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/xomijobolozixisusutusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/ascaso_i-_mini_i2_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/18046967999.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/xuxowemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/refoterubavekuvosabemago.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1461/files/intermediate_accounting_spiceland_7th_edition.pdf
    • https://static.usrfiles.com/ugd/b8c837_831ea1ebc0e44584ac9a44771be2d06a.pdf
    • https://static.usrfiles.com/ugd/576447_e397ed80d45245a8bf03644f447526e7.pdf
    • https://static.usrfiles.com/ugd/fd3290_a613e6ea50164fb3b2bf80b1295b5aba.pdf
    • https://static.usrfiles.com/ugd/73cb9e_2bece5f733d1430b845a0b6dbdf181aa.pdf
    • https://static.usrfiles.com/ugd/8b97dd_e721d4c39b8c42e1acbdc92075d798e3.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_off000062da.bin
5112b9c57a8e5d48a9d826f8773c4e9124c7f5b968094d0be8fd8ee7dc1085f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DA 5388 bytes
font_01_sfnt_off00007504.bin
72415b037059bf9ddbacd6d1f8bf65522fe84277566fba1fd1a63441f525b9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7504 10168 bytes

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