Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b67f0b7d92fe7bc…

MALICIOUS

PDF

47.0 KB Created: 2020-08-06 19:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dadbb81ae4a940c0ff510be9dbc9baea SHA-1: 682f9ac4845396489cc30df0ea6171159c5fc4cf SHA-256: 5b67f0b7d92fe7bc8a30da3f2908f4da54d59939a11893d89b5f7dcf7896e311
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The presence of many external links suggests a link farm or phishing attempt designed to lure users to malicious sites.

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.ru/pify?keyword=bigger+faster+stronger+program+pdf
    • http://files.elizabethandersondance.com/uploads/1/3/1/8/131856479/xovusel-sededojonetog-migoguvufotevak-sutowafavisi.pdf
    • http://files.oasismassagemckinney.com/uploads/1/3/1/3/131384573/gakijapadajadilurat.pdf
    • http://wazol.michiganpooltournament.com/uploads/1/3/0/7/130775085/tenabupizid-ribowumudapili-pufudiv.pdf
    • http://files.tdobbsart.com/uploads/1/3/1/4/131454523/6453266.pdf
    • http://files.watervlietpubliclibrary.com/uploads/1/3/1/3/131398117/d497b38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/skyjack_sjiii_3219.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/13734025789.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9271/files/98821886604.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/bekirozevogonajalib.pdf
    • https://cdn.shopify.com/s/files/1/0429/1428/3686/files/jupibesolidome.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/23747155057.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0428/7011/2423/files/10822361679.pdf
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/27095391544.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesulemenakasisot.pdf
    • https://cdn.shopify.com/s/files/1/0438/4758/1856/files/jiwetodul.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8095/files/html_to_api_free.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_off000077dd.bin
2bd84c51ec7b8dba7259799ae3f9845ebac3f51468c7393dfebe497e25b40b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DD 5380 bytes
font_01_sfnt_off00008a17.bin
453911be6380f6f3e43193e0fca5f56b3ae60a3a722d9aea5c2366bf3c004d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A17 10764 bytes

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