Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb26e06015c3e4c1…

MALICIOUS

PDF

52.5 KB Created: 2020-08-20 20:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261d92f93df515e79684f8bcd8229e14 SHA-1: d22729b28ce23c1149e0bbdd9d94f3af21382725 SHA-256: cb26e06015c3e4c1c53cf6ebf295db03256ca405560cf92eaa21bf9819e2c1a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=castlevania+rondo+of+blood+ost, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent.

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=castlevania+rondo+of+blood+ost
    • http://negose.helenlloydaudio.com/uploads/1/3/1/1/131164104/gabet_sidexogaf_gumipilaxew.pdf
    • http://files.matimba.com/uploads/1/3/2/3/132302718/6122651.pdf
    • http://files.group-wb.com/uploads/1/3/1/8/131859895/lidaberekaxerudisive.pdf
    • http://suval.spikemclarrity.com/uploads/1/3/1/8/131872295/wusoruzog-vilurujixozuf-liwabinesi.pdf
    • http://sufek.veerahiranandani.com/uploads/1/3/2/6/132682787/sunikopu-weroviwisex-xebipenegek-tavobu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7525/files/litowukorusarenorusajuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2828/2529/files/autotune_free_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/0415/8364/files/simple_messianic_passover_haggadah.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/50129710780.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/33841255617.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1062/files/xugunewe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6895/files/wevajetanatemunidubu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2432/files/20797883056.pdf
    • https://cdn.shopify.com/s/files/1/0452/3150/5565/files/81938990893.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/1097650250.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6436/files/best_wow_private_servers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/vatokugubumarote.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e3e.bin
84b09ab337f1fb169fcec5ff43f4e7498b2bc3d96aaab4858b5d6f3ec0970560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E3E 5628 bytes
font_01_sfnt_off00008165.bin
639d886fe962ad5e31e44318b0874a99057a831b7283e0bda51b65367368a564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8165 4912 bytes
font_02_sfnt_off00009221.bin
8a641c1c21b51f9e7ec5ba108f4d08ac32e226ab8446ef0d496015298f6de4e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9221 10420 bytes
font_03_sfnt_off0000b5d3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 4324 bytes

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