Malicious PDF — malware analysis report

Static analysis result for SHA-256 6151909e9fd8412f…

MALICIOUS

PDF

63.9 KB Created: 2020-08-30 04:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bb52d80e9a28887b3ebbc29e303eb4c SHA-1: 984f26dd7f899f10e9fec6a65867c64c55457c18 SHA-256: 6151909e9fd8412f90e2d53e946362cd3a92cb9a11a3dd78e1d878055730fc4d
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to further malicious content. The document also contains a large number of embedded links, many of which point to PDF files hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

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/wix?keyword=rpm+speed+and+machine In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_483394ee66ae42fe82a0d3b3a35fe1b5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c3f3980ecb40432683dddd56453d5a04.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_f8d12838077847a99950e74cb370d10e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5926b4_cd9cf85899b24a13818f8e1f92342724.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2177/0657/files/66961188923.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0301/8392/files/alkaline_acid_food_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/4412/1248/files/caput_succedaneum_y_cefalohematoma_diferencias.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6354/1917/files/biology_resource_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2249/0532/files/the_two_most_important_days.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/58012258127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/giraxijonoxiziw.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d162e3_a53250baa3a94a3aa396ca56d9ece367.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c4ccc4_efeba21ded0d45ffbfcbe20f40841c5c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ea2f88_f6ffc88e37144229a7f4ee119bf34159.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1ff2533c4c3f4d0db9f272b2c5c62050.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8b7.bin
ea6fb13293ed7a5de234b5d3c2cb7c2f4bc3fec9f6e7538347f6c07527993bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B7 5192 bytes
font_01_sfnt_off0000ba35.bin
39f3c5c4f87d39e2c8c545fdc752371bea2e3b8f644c03bec3cac0bf42995ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA35 10284 bytes
font_02_sfnt_off0000dd8a.bin
04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16112 bytes

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