Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e2d57a0791da94…

MALICIOUS

PDF

136.7 KB Created: 2020-08-03 12:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 484d37f07881d4b68f5214cfd4a19131 SHA-1: c14dfd0524808d1b2b1aff3ee1df4d831a8c28d4 SHA-256: 13e2d57a0791da94412c148e701dfc67c881b674ac2552adbed72b63709590b1
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector's target. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/pify?keyword=sepsis+and+septic+shock+pdf+2020
    • http://files.kennetheugenepeters.com/uploads/1/3/0/8/130874400/6959958.pdf
    • http://files.greenislegardens.com/uploads/1/3/1/4/131453897/2333953.pdf
    • http://files.uticairish.org/uploads/1/3/1/4/131406427/8fccf26936b.pdf
    • http://files.caddaypie.com/uploads/1/3/0/8/130814283/c2a09.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/69694974677.pdf
    • https://cdn.shopify.com/s/files/1/0429/6340/2905/files/kokulatimaxufukolemajav.pdf
    • https://cdn.shopify.com/s/files/1/0429/6966/1589/files/56858918996.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/xazafavewijewele.pdf
    • https://cdn.shopify.com/s/files/1/0434/9139/3698/files/96634020132.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/delta_shopmaster_band_saw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6435/1130/files/2042324237.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/automatic_products_vending_machine_hack.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/tapodu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5490/4997/files/kudejitefukamorotofo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8875/4328/files/nokuwoluxupawa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2730/8454/files/82726788478.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_off0001da4a.bin
df211d7cb83f29912810f1d09df981ca1342574a8673c6df157c5965ada8c275		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA4A 5556 bytes
font_01_sfnt_off0001ed39.bin
196137fb02a08f8114ce53633ec6bf59bbfba5fff896b2ccb3bddb70f002a473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED39 12376 bytes

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