Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eae1620f1170ca8…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 03:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 091babe5116e4ad8d4956e4960d1fd1a SHA-1: 15ca5a5dd7034031551f6bd17a08d776981a545a SHA-256: 1eae1620f1170ca88712a8debe406fc53e4a26987c2111bbaa4b21df550ee074
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure related to a 'nursing drug handbook'. The primary malicious URL identified is https://ttraff.com/wix?keyword=nursing+drug+handbook+jones+and+bartlett+pdf, which likely serves as the initial point of compromise.

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/wix?keyword=nursing+drug+handbook+jones+and+bartlett+pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/mefokinu.pdf
    • https://cdn.shopify.com/s/files/1/0462/8126/1205/files/bppv_exercises_epley.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/jivufataki.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/xibogagerupilulurepuwuz.pdf
    • https://cdn.shopify.com/s/files/1/0447/3955/9578/files/business_administration_study_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0933/files/kujeju.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/force_table_physics_lab_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/caterpillar_c12_engine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/2312/2084/files/wizevatokar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0966/2366/files/pufimepidoxalopigi.pdf
    • https://static.usrfiles.com/ugd/b8c837_88084b219d49446ca5643107649763e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_68e2dc9261bb40a9a60e40b5ca68ed52.pdf
    • https://static.usrfiles.com/ugd/b8c837_e28ad10048174f96ad44a077dbc55c73.pdf
    • https://static.usrfiles.com/ugd/b8c837_d9650739f6e74c8c9943b45048927cb4.pdf
    • https://static.usrfiles.com/ugd/b8c837_edd33d551f4f421bb0b5ca9025c349b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3f6b4ee8161407194d91592018acd25.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_off0000601b.bin
11f440b12e863b25b62a02a5ac5f296a6cf54f183925477e293b94792108edf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x601B 5552 bytes
font_01_sfnt_off000072f8.bin
803a33e8723a4a28337590f222b1d9d6d84796970026e743a401963a85a8b5f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F8 10120 bytes