Malicious PDF — malware analysis report

Static analysis result for SHA-256 06e4960c801be7ae…

MALICIOUS

PDF

54.5 KB Created: 2020-07-21 20:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bce4cb66a6accd0686164d973c6de54c SHA-1: 0895ecdd16a50fba7c7906e31588fa76bb3f4544 SHA-256: 06e4960c801be7ae7c8f462f0f2dfb66e6f0ae5c93609a9806b460de6c46cd96
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with the primary redirector URL being associated with malicious activity. The document body, though heavily obfuscated, suggests a lure related to 'college comparison worksheet pdf'. The ML classifier strongly indicates maliciousness, supporting the attack pattern of using embedded links to redirect users to potentially harmful sites.

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.ru/wb?keyword=college%20comparison%20worksheet%20pdf
    • http://files.davidthornecri.me/uploads/1/3/0/7/130738806/kopekapokaxize-niketolatini-tugegosaxa-powamesezusifak.pdf
    • http://files.lindsayjanefitness.com/uploads/1/3/1/4/131437322/noxurewogolene-murokizute.pdf
    • http://files.autheatrewing.com/uploads/1/3/1/6/131636758/voduxadorovo_radererep_nonipuzewometed_gotobes.pdf
    • http://files.srtsl.com/uploads/1/3/1/1/131164474/6944004.pdf
    • http://files.whitelakeholidayresort.com/uploads/1/3/0/9/130969428/bizilabesobiwunaki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7212/7125/files/95655638790.pdf
    • https://cdn.shopify.com/s/files/1/0429/1965/7628/files/lipexokajefakewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/16535726698.pdf
    • https://gigifovagipe.files.wordpress.com/2020/06/naxozazew.pdf
    • https://gosijanasi.files.wordpress.com/2020/06/73323519905.pdf
    • https://runowabak.files.wordpress.com/2020/06/16115979197.pdf
    • https://fuwedibet.files.wordpress.com/2020/06/21422585216.pdf
    • https://tupazipino.files.wordpress.com/2020/06/53843433427.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/rupita.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/fuzugomujo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2075/3823/files/lurozuxiwetisewemofamatu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/ladabugomibomokifo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/parunakepanugulevojosep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texigusowemojegovivek.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/pafidikowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/vizudagux.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/lobat.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_off00009614.bin
283e4d64ee281f96bde61988f20c5ede4a1e16a6f8f4c519b24301f57a53a538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9614 5536 bytes
font_01_sfnt_off0000a8ce.bin
5cb4d84a44828f8f44720a127032bf56b03b6bf8824967d2e1b3cc74e524d42a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8CE 10532 bytes

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