Malicious PDF — malware analysis report

Static analysis result for SHA-256 3def1921b8748ef1…

MALICIOUS

PDF

68.3 KB Created: 2020-12-15 20:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18f9754cf3f7ccbd9ed3e4f0b4a8d8d2 SHA-1: d2ce54f0e841da4c703ddfbf7be2eb74f4d682cc SHA-256: 3def1921b8748ef163b2c0cc1a9880542bc3c62ca93716a2ad653a738e181678
154 Risk Score

Malware Insights

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

This PDF document contains a high number of embedded links, many of which point to a link farm infrastructure designed to redirect users to malicious sites. The primary redirector URL identified is https://cctraff.ru/123?utm_term=towson+high+school+lacrosse, which is flagged as malicious. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=towson+high+school+lacrosse
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/zujajuso.pdf
    • https://fijateri.weebly.com/uploads/1/3/4/3/134371572/2903194.pdf
    • https://cdn-cms.f-static.net/uploads/4392650/normal_5fbfa6b52946d.pdf
    • https://sewiwojura.weebly.com/uploads/1/3/4/3/134371681/gibomufopojodib.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/f9007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jepinebawo/dixoxedimuleno.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf8c66a371610b87721b2/1606219975988/15th_wedding_anniversary_quotes.pdf
    • https://s3.amazonaws.com/pirosisob/age_of_empires_android_game_free.pdf
    • https://static1.squarespace.com/static/5fc2acbc27a199023ac0d2d4/t/5fd0f8b00563c5257069ef4c/1607530678266/3d_asteroids_game.pdf
    • https://s3.amazonaws.com/dobikasukavu/asap_ferg_songs_free.pdf
    • https://s3.amazonaws.com/widofafane/william_cronon_changes_in_the_land.pdf
    • https://static1.squarespace.com/static/5fc78fbebcf5f06bcb797f70/t/5fcd4604c00f007ceaf57e1c/1607288326647/99911037824.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/hard_drive_configuration.pdf
    • https://s3.amazonaws.com/pazifetanegapu/61061374312.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_off0000cf80.bin
1111a8481bcb92f6438a5563b86757ba4de798e269a4c71c74d154a378417cc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF80 5104 bytes
font_01_sfnt_off0000e0f0.bin
2432f19119db660d7812a1a96a2136612820122531fbf408e1fa25dfd85ccd11
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F0 10524 bytes