Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b70e2dba9cf297…

MALICIOUS

PDF

43.3 KB Created: 2020-08-23 20:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dde9e35649a1a2b8c9e870016c16d1b5 SHA-1: 098884f2216e9add325b8a4ace4cf5fa20f5a53f SHA-256: 82b70e2dba9cf29784b478dd8bc8d6de210394c97ec6e2e4f7b55950411c8846
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a lure related to 'basketball jersey template design' and embeds numerous links, many of which point to external PDF files. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify. The ML classifier strongly flagged this PDF as malicious, and the 'SE_BROWSER_INSTALL_LURE' heuristic indicates a social-engineering tactic to trick users into installing unwanted software or visiting malicious sites. No scripts were extracted, but the presence of malicious links and the social engineering lure are strong indicators of a phishing or malware distribution attempt.

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.com/pify?keyword=basketball+jersey+template+design
    • http://files.colvigconsulting.com/uploads/1/3/2/7/132740925/rupazakokosotu.pdf
    • http://files.sanchezartgallery.com/uploads/1/3/1/6/131606111/valujosiro.pdf
    • http://files.thesingingsommelier.com/uploads/1/3/1/4/131405940/6712444.pdf
    • http://files.concretebendoregon.net/uploads/1/3/0/7/130739015/f68318e28febd.pdf
    • http://files.calledoutsetapart.org/uploads/1/3/2/6/132681307/tujuwunowod_lilukab_diwoxoto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4214/3397/files/makanaginosutokeda.pdf
    • https://cdn.shopify.com/s/files/1/0450/0144/1448/files/the_ultimate_rpg_character_backstory_guide_tg.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/kogovigotutijulize.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavatorumagenikezelun.pdf
    • https://cdn.shopify.com/s/files/1/0464/9435/1512/files/adobe_acrobat_reader_chrome_extension.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/zudumari.pdf
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/fawusapolimefujajokuwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2704/6301/files/mulozizabozenolodulag.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/90810502237.pdf
    • https://cdn.shopify.com/s/files/1/0434/5973/9814/files/wopedudaxu.pdf
    • https://cdn.shopify.com/s/files/1/0463/1540/5472/files/39218438730.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/pdf_splitter_mod_apk.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_off00006135.bin
a41ad08f095c278a8751e39b0f5cdbd7ec11d4caac422e408e95fc11deaea940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6135 5712 bytes
font_01_sfnt_off00007497.bin
c9adf5b3e75773dfd66e86f1ca7c18e6654ccbd51de6d15bf227ff15f4c73484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7497 13908 bytes

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