Malicious PDF — malware analysis report

Static analysis result for SHA-256 732aca3ed933ee64…

MALICIOUS

PDF

60.3 KB Created: 2020-09-03 23:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aeb9a84ecb33c5f2e9546763e22d32a SHA-1: 9c3ed5b311ce555fd68c3fd4166f909cb118cbeb SHA-256: 732aca3ed933ee6458347fe30154ed5f512b135b5f5e88e6a43b48673041ba90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to malicious infrastructure. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to a 'Belize travel guide'. 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.cc/wix?keyword=belize+travel+guide+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.pdf
    • https://static.usrfiles.com/ugd/20d83a_4d807ccf3eb74e7492da9b3a38db3bea.pdf
    • https://static.usrfiles.com/ugd/71fd01_2c6149bf30f44cc8bc94cacfcdb03906.pdf
    • https://static.usrfiles.com/ugd/b8c837_c89d68849be6470da648a9c094566a68.pdf
    • https://static.usrfiles.com/ugd/800b88_3590b82476f14e88b61c4091c7273141.pdf
    • https://static.usrfiles.com/ugd/4bb894_bb3717a3b18f40f3bc325ed40a284047.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/fapuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5565/1743/files/canal_9_salta_bien_informados.pdf
    • https://cdn.shopify.com/s/files/1/0436/8501/9801/files/python_3_string_replace.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/lebesgue_measure_and_integration_gupta.pdf
    • https://cdn.shopify.com/s/files/1/0435/5555/3443/files/oracle_cash_to_general_ledger_reconciliation_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/32223391393.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_off0000aecb.bin
e00fcd4edbd1505745aac501cccc71a6afc653249adba02dd2b3e1b7d96f4c40
pdf-font-stream PDF embedded font (sfnt) at offset 0xAECB 5188 bytes
font_01_sfnt_off0000c097.bin
56b6d85013f41a1766be9f08bed8729632092a655b5e590975576247dfef1212
pdf-font-stream PDF embedded font (sfnt) at offset 0xC097 10636 bytes