Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da0d1c5b53135d4…

MALICIOUS

PDF

35.9 KB Created: 2020-09-06 20:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7474b5289ca4c1ffa59f4b1a7f494c57 SHA-1: 2d78995ef23bf3ae10fb300a9818dcc2f3fa16b0 SHA-256: 6da0d1c5b53135d42a0262043cfec6c8e8a9db0563266be9221d7eefa81d2c58
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document also contains a heuristic for a browser installation lure, indicating a social engineering attempt to trick the user into downloading potentially malicious software. The presence of numerous Shopify links, while marked as benign, suggests a link farm tactic to obscure the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.link/wix?keyword=fast+browser+video++apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8576/5533/files/78365842413.pdf
    • https://cdn.shopify.com/s/files/1/0429/7955/7535/files/corbett_maths_metric_and_imperial_units_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/fivuki.pdf
    • https://static.usrfiles.com/ugd/b8c837_f81a524b494b4cceaccf729746aa510e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0536c9bc57ad472bbb5a5fa32ff314f3.pdf
    • https://static.usrfiles.com/ugd/930050_01eccaf54eaf4df7b48fb3dd061b428f.pdf
    • https://static.usrfiles.com/ugd/37428b_53f0b8c3b5e74f1ba132846890ca2f40.pdf
    • https://static.usrfiles.com/ugd/e643da_e0eeb66050484d59979ac10f09ee6bd3.pdf
    • https://static.usrfiles.com/ugd/a640e9_4d387404ffa143d7a0aaea01a5ec81a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d82c79d688e4fb28c8073b1860b3c42.pdf
    • https://static.usrfiles.com/ugd/f5892c_92d34b980b8b483b9b36fc9d4728c1c5.pdf
    • https://static.usrfiles.com/ugd/e1c37d_6989ebabbbcb4db682c39e74ffc92bd1.pdf
    • https://static.usrfiles.com/ugd/71fd01_0a2e1be78fb84fa6ab5bcb6bf79d9049.pdf
    • https://static.usrfiles.com/ugd/0d2fda_c1ea2c3e5f884e2986ab321f56388d28.pdf
    • https://static.usrfiles.com/ugd/aa14a9_63e1c24fa202427ba1deb3c087f4305d.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_fc090a4b83244f0da2902b21f73ccf50.pdf
    • https://static.usrfiles.com/ugd/5af86b_edb6b38ecef344d39638008ef8acba42.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_off00004e07.bin
5822886af797e99326ced05ea1d28f0fc448c432675ee3a55df559d14a9e8dff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E07 5232 bytes
font_01_sfnt_off00005ff5.bin
b653d3ff1f7af79c18a9a8d892bad8abe3b987fbf502de705011f263c90df0b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF5 10192 bytes

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