Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb1dea09b5793a5…

MALICIOUS

PDF

40.4 KB Created: 2020-08-14 23:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207f94e5fe656579c721a2d2b907d694 SHA-1: 7b5b8184b15dd07a9ac2c5048f63704b69e52689 SHA-256: 0fb1dea09b5793a5805336565040dbd182c98beeae40bc38f93e63d7fc9ba649
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure to download further malicious content, likely a second-stage payload. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=junos+firewall+configuration+guide
    • http://muvijopu.madame-allen.com/uploads/1/3/0/8/130813528/kiwipufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/xokozikeja.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/34328551126.pdf
    • https://cdn.shopify.com/s/files/1/0432/3583/6072/files/gexiwopuxiwarefudoruratew.pdf
    • https://cdn.shopify.com/s/files/1/0447/0597/2380/files/totupuwogokosusapulopi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/fapewosipawewedizerar.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/50816770213.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2303/files/drdo_ceptam_syllabus_for_electrical_and_electronics.pdf
    • https://cdn.shopify.com/s/files/1/0432/5225/2829/files/anthony_robbins_books_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/3314/8062/files/satadif.pdf
    • https://cdn.shopify.com/s/files/1/0446/1504/1187/files/corporate_bylaws_rumah_sakit.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_off000057ef.bin
c7fb47b9f6f0a065761bd725af333b80aec49f44726761f4ad3451ce165612eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x57EF 5268 bytes
font_01_sfnt_off000069f5.bin
e7b67e44a5f4b373997ffb07268c7138e9ca0e4c37f215259198d6c8760448b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x69F5 13596 bytes