Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5b4e6bf0dab845…

MALICIOUS

PDF

70.1 KB Created: 2020-08-19 17:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8359bec2b7246cba6ca662593927581 SHA-1: 915f99eccc70edaa03ce984b1f29a3cfcb79d9e8 SHA-256: bf5b4e6bf0dab84509ab25f4fcca62c31a4135a33ca4c7c695b78f1f3eaf3f10
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL 'https://ttraff.cc/pify?keyword=non+canonical+books+pdf' is a clear indicator of a malicious lure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, reinforcing the attack pattern.

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=non+canonical+books+pdf
    • http://lileza.laplayaatthestrand.com/uploads/1/3/2/6/132680981/gumomuraxi.pdf
    • http://walelosi.newlifeeastla.com/uploads/1/3/0/8/130813821/2fda3677280eea.pdf
    • http://files.horsesbyelliehesse.com/uploads/1/3/0/7/130775750/gewuzaka_fobevewoga_dusafitokabixi.pdf
    • http://files.hyderabad-greenacres.com/uploads/1/3/1/8/131871494/bevokanajiriv_sevopalu_ritapolojenagi_mogalenuzaxekip.pdf
    • http://files.spaidsllc.com/uploads/1/3/1/1/131163943/lezaxubibiwerix.pdf
    • https://cdn.shopify.com/s/files/1/0457/3347/8566/files/95738897250.pdf
    • https://cdn.shopify.com/s/files/1/0436/3704/7449/files/stock_market_terminology_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/35133504654.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0133/files/pigapudekumonuvojumu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/23828364788.pdf
    • https://cdn.shopify.com/s/files/1/0433/0933/4683/files/how_s_your_day_best_answer.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2394/files/xakekesuxibuborufiniwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/fogatozinarifebag.pdf
    • https://cdn.shopify.com/s/files/1/0429/2601/4620/files/8761108973.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/fekirumemizevajuninexul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f4.bin
1d5cefe8a79876b54fbb2963727f3bf005808c9bde9f30162dff86c5480721b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 5224 bytes
font_01_sfnt_off0000e7c7.bin
921e4dd3b35b98effd3e9ae51bd348c5f94a37db7aed9c7abd7d66342f450c73		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 10436 bytes

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