Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f8f7c6df8f98a4…

MALICIOUS

PDF

38.6 KB Created: 2020-08-04 21:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb25b98df40f17bf8aa32d65b40af080 SHA-1: f667c347974f9e40b7b9c1e96a4e92b9569129b6 SHA-256: 23f8f7c6df8f98a47075fbc713434c0b2ca1fcbf4cb4d33c933ea1c853eb7679
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised as a curriculum document. The primary malicious URL is https://ttraff.cc/pify?keyword=critical+care+transport+core+curriculum+pdf, which likely leads to a further stage of the attack. The ML classifier strongly indicated maliciousness, and the presence of numerous external links points to a content-scraping or SEO-based distribution tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=critical+care+transport+core+curriculum+pdf
    • http://files.diabetesuniversitydmcp.com/uploads/1/3/2/8/132815791/5277034.pdf
    • http://files.januszsupernakwebsite.com/uploads/1/3/1/3/131380171/fatukimelak.pdf
    • http://files.sunriseonlinenews.com/uploads/1/3/2/6/132695546/pexidoluzapafepabiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/87918494078.pdf
    • https://cdn.shopify.com/s/files/1/0430/8366/1461/files/fetugagab.pdf
    • https://cdn.shopify.com/s/files/1/0434/0498/4483/files/89372312367.pdf
    • https://cdn.shopify.com/s/files/1/0431/4339/7525/files/alphabet_english_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0489/5143/files/fevar.pdf
    • https://cdn.shopify.com/s/files/1/0434/4853/3142/files/jisaniruwumodesopijonezaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufalelavajukunegaxiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/61791795816.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/vogekupefifenavomaliguba.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/50778066535.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/pillars_of_eternity_garodh_s_chorus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004429.bin
6f7cc4e777ce00bd69ff38773e4163ec002f82803796617f6b87849328f20a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4429 5208 bytes
font_01_sfnt_off000055c2.bin
96a28abd4f1ed798065ed367aae47ce26b6c00779b16b58cf6f667b5f1c31635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55C2 9956 bytes
font_02_sfnt_off000077fd.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FD 16204 bytes

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