Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea953afa5cc481e…

MALICIOUS

PDF

70.7 KB Created: 2020-11-19 02:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a25c565f37ad5d82a788b5bf91a70a1 SHA-1: d40dcf2f616433940f6cce1d43b71f9d85204429 SHA-256: dea953afa5cc481ed843e4a5a70a56a4181b3fab9982b691c53547fc181eac72
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics as a malicious redirector and link farm, indicating a high likelihood of phishing or malware distribution. The embedded links, such as 'https://cctraff.ru/123?utm_term=all+brickmania+kits', are designed to lure users to malicious sites. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=all+brickmania+kits
    • https://wofinomedek.weebly.com/uploads/1/3/4/1/134108675/vazid_bixosopegojazag_foxakipot.pdf
    • https://mibonapa.weebly.com/uploads/1/3/4/3/134308174/bilijav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sasufufa/zanarkand_theme_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/ccdf0b18-4eb6-4199-9356-02a311bc1fd8/monukuxunofagezafo.pdf
    • https://s3.amazonaws.com/degagaziv/begupi.pdf
    • https://s3.amazonaws.com/memul/tojixedunurajilekan.pdf
    • https://uploads.strikinglycdn.com/files/e3a6e616-b398-4166-8a4c-dd44b24a1582/duzurokilunititiwaw.pdf
    • https://s3.amazonaws.com/lupebesu/door_access_control_policy_template.pdf
    • https://s3.amazonaws.com/sazariwapa/ashab_e_kahf_story_in_bangla.pdf
    • https://s3.amazonaws.com/pozokimepe/wevabimoduxifat.pdf
    • https://s3.amazonaws.com/rubidokezive/formation_complete_excel_2007.pdf
    • https://s3.amazonaws.com/nafoxuda/89331933298.pdf
    • https://s3.amazonaws.com/jutenojamega/50097261171.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_off0000d6c4.bin
4f392b0bbd2706f4b4561c0877c00ed5537bc5ab0d8ae310ef0b86552af82778
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 5140 bytes
font_01_sfnt_off0000e825.bin
1947b4fed4a0429c5d625af5045fd95a9721d3ed967b5826e51889045c7859f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 11072 bytes