Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb5b5f50116a19b…

MALICIOUS

PDF

52.9 KB Created: 2020-08-16 13:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e9b3873cbb0283e976136638c7e9e4 SHA-1: 596bf0957418cfe2dd6b20ef6c5b11d026bc1713 SHA-256: 9cb5b5f50116a19b9c2bd95511d1e0d9c6cb9d2f42120dab4354e032258a9d99
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a lure related to 'The Guardian Simon Baker episode guide' and embeds a significant number of external links, many hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=the+guardian+simon+baker+episode+guide', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector suggests an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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.com/pify?keyword=the+guardian+simon+baker+episode+guide
    • http://files.alfredmontessori.com/uploads/1/3/0/7/130739062/gekarutabemev_daraxit.pdf
    • http://files.cascadiamotion.com/uploads/1/3/0/8/130813692/tixukujirokupaj.pdf
    • http://files.nmwordprocessing.com/uploads/1/3/0/8/130874252/xapeminofafaf-vuxijoninis-kejetopo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5106/3195/files/likibuponi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3423/7345/files/18864038353.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2398/files/lusakotemunopudexunopuwuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/0546/7035/files/cambridge_mathematics_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9029/files/46993503230.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/widonoxarasibuturugava.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2135/files/how_to_install_opencv_in_ubuntu.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000090eb.bin
c8e5eadb9cb03f9f71e4bb56cdda054f3d169c4c6d0b9136e1cee672ec1f8968
pdf-font-stream PDF embedded font (sfnt) at offset 0x90EB 5496 bytes
font_01_sfnt_off0000a36e.bin
36cf296fa62e0b59a06def9252a3745d2b1b41d70fa2c105ba265bec03cb66b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xA36E 10260 bytes