Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d3b9bbd753fc67…

MALICIOUS

PDF

48.7 KB Created: 2020-08-06 20:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0f829855a28ce76775b46384448ec7 SHA-1: f1740a15d279e3bb50354f97505883e67e6db7c0 SHA-256: 73d3b9bbd753fc677acb74600cfdf0248b99a6aff6698571ceb99390b74230c8
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a social engineering lure, instructing the user to install a browser extension or update to view content. This leads to a malicious redirector URL, which is a common tactic for distributing malware or phishing. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including a redirector, supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.ru/pify?keyword=add+in+word+2020+pdf
    • http://files.southcarolinapac.org/uploads/1/3/1/3/131380001/nifif.pdf
    • http://files.riptworkshops.com/uploads/1/3/1/3/131383283/vakono_nezujiweb_vuwasubakoso.pdf
    • http://files.touringindustries.com/uploads/1/3/1/4/131406086/ranabole_xasulapexip.pdf
    • http://files.russmillssigns.com/uploads/1/3/2/6/132696154/wexeduladifawetejaf.pdf
    • http://files.magnifiscentsoap.com/uploads/1/3/0/7/130740458/befa6d61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/28191029500.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/95203430750.pdf
    • https://cdn.shopify.com/s/files/1/0429/0599/3375/files/sazamobapexabudurabokod.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0250/files/7820359945.pdf
    • https://cdn.shopify.com/s/files/1/0430/4191/5042/files/wheels_foo_fighters.pdf
    • https://cdn.shopify.com/s/files/1/0433/7437/9157/files/zukudajosim.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/74687640701.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/34692633915.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/makalah_alkalinitas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5305/5128/files/convert_file_to_word_document_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/70885605431.pdf
    • https://cdn.shopify.com/s/files/1/0433/6333/6350/files/tidixeseperivakut.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/nekivifuxewoko.pdf
    • https://cdn.shopify.com/s/files/1/0435/8435/6507/files/53298829756.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0072/files/gotolexexidibalekagekopok.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008156.bin
54d02f44a4f973bc5c0e49d22e6307be85b15cee3af1f8d160e048c9eb47b0e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8156 4968 bytes
font_01_sfnt_off00009266.bin
f0769111154a48a26613f48e66b1acaedb7e2dbf30cdd438248be8fe07fbe583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9266 10268 bytes

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