Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd115cd5b1ece68…

MALICIOUS

PDF

55.5 KB Created: 2020-09-30 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e04269bd40d0e3d06e315bf3a3a18c0c SHA-1: fad1e83c8901288325fdc7e02f1afce1fd4a223d SHA-256: 0fd115cd5b1ece687cd413a7873b990980a994faee41a8c00d6271656614c84e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to '12th integration formula pdf download' and numerous URLs pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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://gettraff.ru/strik?keyword=12th+integration+formula+pdf+download In PDF document text
    • https://site-1038595.mozfiles.com/files/1038595/21076576011.pdfIn PDF document text
    • https://site-1036977.mozfiles.com/files/1036977/18099607156.pdfIn PDF document text
    • http://files.kimblevins.com/uploads/1/3/1/4/131438438/kokuvige.pdfIn PDF document text
    • http://files.lisakalma.com/uploads/1/3/1/3/131383329/zumulara.pdfIn PDF document text
    • http://kibuzire.pavilionsuites-klcc.com/uploads/1/3/2/6/132681352/puvewubudupix.pdfIn PDF document text
    • http://files.dare2bu.ca/uploads/1/3/1/3/131383892/fufogobazi-bakonolat-fogovemi-voxaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5571/8298/files/33750022572.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6259/9585/files/dermalogica_skin_smoothing_cream_1.7_oz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0975/9641/files/staff_appraisal_report_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/ranotepewuvilumosogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0989/2767/files/best_magnetic_charging_cable_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/hancock_grammar_school_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1167/8114/files/wasotaretobakug.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C4 5456 bytes
SHA-256: 81321cf5aaa08d5db3e0edd9c7f9c9b8c49b7f9386addac0261b519a7ac15553
font_01_sfnt_off00007449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 15252 bytes
SHA-256: 3caff02aee2f8f240c54259391c7e0e48ef011afd2f81b9e1f3529b480a3fd35
font_02_sfnt_off0000a3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3C5 16148 bytes
SHA-256: e14974f0870454f0d27ba76c083f831693e8089a4b1d1aecf211a3af7a173f3a
font_03_sfnt_off0000b90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90B 6772 bytes
SHA-256: ebb54f5f9b4092bdb51e0be264261311ec2d38e24fa0e39db14c5e0e5f983156

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