Malicious PDF — malware analysis report

Static analysis result for SHA-256 9435634fe85f6785…

MALICIOUS

PDF

41.8 KB Created: 2020-08-29 12:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16a934d0fad7468f4f0aa7a8b467db8c SHA-1: 95db3f2db6432b08272dc5c2c3d5a4b0a9bed8bf SHA-256: 9435634fe85f678530c6837a3745f1cc955b8a7bf55d03d054b135fd836719bc
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.me, disguised as a meal plan. The document body and heuristics indicate a lure to this malicious URL. The PDF also contains a large number of links to other PDFs hosted on Shopify and static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to distribute the malicious content.

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.me/wix?keyword=code+red+meal+plan+pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/python_ascii_to_int.pdf
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/doubly_linked_list_template_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/6363/1272/files/balochistan_issue_articles.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/the_conformist_alberto_moravia.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6d5eecba3124a9682269b690e4c0864.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c2b4949788c4213a65bdd99df67cc4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f14a9d7dc1f4e0186bb33fb7c1de131.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/warogopetubedubotagirej.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/siliwenawuditirufumera.pdf
    • https://static.usrfiles.com/ugd/2f8cea_0fa65f8ac24d4bbea5e6000fa83d7e24.pdf
    • https://static.usrfiles.com/ugd/b8c837_13069e5ea59e426e91a94cabcaab5760.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef8c8bb4359c418c997a27350ab953b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9442942980d449109f7e8df780c43b35.pdf
    • https://static.usrfiles.com/ugd/b8c837_7b2479e28a4d495c8cc815b2114e371e.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_off00006673.bin
cc00a48e0120ac9424833a5f34599eff2dd35a48e47a246486cf7b45f0a7b468
pdf-font-stream PDF embedded font (sfnt) at offset 0x6673 4916 bytes
font_01_sfnt_off0000770c.bin
dd6337899f136ba2046454a5dc14aac7b9dbd24cf862d1cfc589fc2cf27d078d
pdf-font-stream PDF embedded font (sfnt) at offset 0x770C 10332 bytes