Malicious PDF — malware analysis report

Static analysis result for SHA-256 640eb9f4d482e9cf…

MALICIOUS

PDF

42.7 KB Created: 2020-08-03 04:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf84b3a1409639028fa584292bb843ce SHA-1: a71d1cfd3d678e2c7428c808b2bf8812ecfb5c14 SHA-256: 640eb9f4d482e9cf6f5c4f5ef5498dc9fe4e7e78ba82a39872faff146d254143
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a lure to install a browser extension, directing the user to a malicious redirector URL. This is a common social-engineering tactic to facilitate malware installation or credential theft. The document also contains a large number of links to other PDFs, suggesting a link farm for SEO manipulation.

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=youtube+video+downloader+chrome+extension
    • http://files.nzosi.com/uploads/1/3/2/7/132740270/kobijo-vaxipa-fonom-relobitamademu.pdf
    • http://nakerigo.acupunturavetbarcelona.com/uploads/1/3/2/3/132302963/5311415.pdf
    • http://files.friendsfpcs.org/uploads/1/3/1/4/131453401/9583793.pdf
    • http://files.tomfontaineceramics.com/uploads/1/3/1/0/131070938/304fb76c90c0d4.pdf
    • http://files.arelationshipcounselingcenter.com/uploads/1/3/1/0/131070483/6db4198ad8e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/megesoriwedud.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/rokidodokolowerekenomipax.pdf
    • https://cdn.shopify.com/s/files/1/0428/4933/7507/files/twisted_spoon_pixelmon.pdf
    • https://cdn.shopify.com/s/files/1/0434/7219/1641/files/61706801817.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/14386876091.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/56330481950.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/99426259275.pdf
    • https://cdn.shopify.com/s/files/1/0433/1867/3566/files/32123632945.pdf
    • https://cdn.shopify.com/s/files/1/0436/0149/4179/files/spotify_equalizer_mac.pdf
    • https://cdn.shopify.com/s/files/1/0439/0282/8699/files/how_to_save_on_imovie.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_off00006717.bin
edca802b018f673c0e3d24350856768d906cc8d61827f3392cfe850e6ad6a38e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6717 5500 bytes
font_01_sfnt_off000079b6.bin
4a1eeb895be5997d639bc2655db568b53a818f75aaed7292895a03c922ecd230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B6 10500 bytes

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