Malicious PDF — malware analysis report

Static analysis result for SHA-256 684ba1f98c4c10f4…

MALICIOUS

PDF

42.7 KB Created: 2020-08-17 01:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 807e5e569595cb8337e0437149c3d5cb SHA-1: 27cdd97dff90f5e383996cc19d2b27fc16624b12 SHA-256: 684ba1f98c4c10f44e47cea733ccb82a97a29cb402609a8af9c7dc08b2a89ee1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One of these links, 'https://ttraff.cc/pify?keyword=bekaboo+web+series+full+episode++free', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the redirector URL and several Shopify-hosted PDF links.

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.cc/pify?keyword=bekaboo+web+series+full+episode++free
    • http://files.ballouskies.com/uploads/1/3/0/9/130969926/784369a7aff0.pdf
    • http://likotev.kairestaurant.net/uploads/1/3/0/8/130874493/a7b6398a.pdf
    • http://files.azaset.org/uploads/1/3/1/0/131070842/rebam-bidugilim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3160/0031/files/sword_art_online_minecraft_mods.pdf
    • https://cdn.shopify.com/s/files/1/0429/9220/5978/files/labotazuwolazirojasuwusug.pdf
    • https://cdn.shopify.com/s/files/1/0437/5370/1525/files/46223720203.pdf
    • https://cdn.shopify.com/s/files/1/0437/1116/8663/files/dnd_5e_saving_throws.pdf
    • https://cdn.shopify.com/s/files/1/0431/9435/1778/files/risafijawuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/miravagaxujuvamop.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/xexoxel.pdf
    • https://cdn.shopify.com/s/files/1/0436/5202/2430/files/70742327694.pdf
    • https://cdn.shopify.com/s/files/1/0428/7086/6087/files/jukelam.pdf
    • https://cdn.shopify.com/s/files/1/0433/5481/6665/files/ultimate_mortal_kombat_trilogy.pdf
    • https://cdn.shopify.com/s/files/1/0433/2067/2409/files/32644322363.pdf
    • https://cdn.shopify.com/s/files/1/0439/1275/7400/files/xewepagituvukeba.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_off00006821.bin
8c92a3fbcf57818d5be92f2445d44f919cd83edc0c5c3b9890d3aaa4af612aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6821 5380 bytes
font_01_sfnt_off00007a89.bin
0a5935c2546d6907caad2e3bb7baa688a57fddbae6b7e490da56094730aabe50
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A89 10192 bytes