Malicious PDF — malware analysis report

Static analysis result for SHA-256 09eae758ff6344f8…

MALICIOUS

PDF

44.9 KB Created: 2020-09-01 11:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0c7f911f45afb2a22f1043ef0a5ee1d SHA-1: 774a3859c3dd2097208cb7c986a82a3b630f1fb4 SHA-256: 09eae758ff6344f8de91507688e2a10175af9ec70b80f476d17a0e71dbd24dcc
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'aws certified solutions architect questions and answers'. This suggests a phishing attempt to direct users to malicious infrastructure. No scripts were extracted from this sample.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=aws+certified+solutions+architect+questions+and+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b72b27a34f524b0f8a4beff5cfb824de.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_9d30078ec4c44c3fa8f11c73627bdeb4.pdf
    • https://static.usrfiles.com/ugd/b98abb_d611bb9b79004386ac21372e65762b32.pdf
    • https://static.usrfiles.com/ugd/9ec29b_b2f957b3d9d6437ebef35713d6c66cb3.pdf
    • https://static.usrfiles.com/ugd/b4a829_f614495d7ddb458c938319e58f336e36.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_518d8d46ac624dc28e4194876e569396.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1b6dd5e34a34c318935621fec93e880.pdf
    • https://static.usrfiles.com/ugd/b8c837_c60d65537eb74b61a35721d0745921d9.pdf
    • https://cdn.shopify.com/s/files/1/0435/4375/6954/files/online_catering_reservation_system_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1477/4169/files/12284996230.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/pagaga.pdf
    • https://static.usrfiles.com/ugd/b8c837_7999ec000b414b9ab60f8d2f27abc963.pdf
    • https://static.usrfiles.com/ugd/9e14ca_25724cd950994d149f1935cc64b63f1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d238e8a2d67e4e41911288f40a2d4cc3.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_off000070d6.bin
8544d3432cf5055900060b07363ea9665c07cd972548cf1c3a52b8591edf6ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D6 5316 bytes
font_01_sfnt_off000082f5.bin
31848d5bbde122af464a9abbf4a85f14365ecfba1c7aceb7f658e44a8a9f4d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82F5 10484 bytes

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