Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c43db2e0f18ad8…

MALICIOUS

PDF

43.0 KB Created: 2020-08-31 16:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f39235cf18945e733b9522ada3e9dfa SHA-1: 9462a00a33dde397731255a6bd04130e1dfb8eaf SHA-256: 13c43db2e0f18ad8e3bd634f95dbe22ebb40597f8bf2763ab1a9b6f0c032b70d
154 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 infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier and redirector heuristics strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites.

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.ru/wix?keyword=find+answers+to+riddles
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_4b8b50b6c65d44b3a894d9dbbbea10e3.pdf
    • https://static.usrfiles.com/ugd/63d3ad_51087636c99142998a5a0180982e3bbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba3326000c4c431b9463f4676d64e347.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce8485c771254e16b8da408b3e5501c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_99b8d2701dec48bc942afa41628ccfdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_a50c5eb6719045658286e5b0bcf964b7.pdf
    • https://static.usrfiles.com/ugd/1f6d71_4f1ea93acc2542a0a861900f2761e88f.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8247b8008014c66982ddd0acc608df6.pdf
    • https://static.usrfiles.com/ugd/3aca14_3eef09c9764741518b6b7a790690e90e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a14da25cc78048a3a60dba82ab30c952.pdf
    • https://static.usrfiles.com/ugd/95089d_33c1fe8b448641a4bbaf0de39188c15b.pdf
    • https://static.usrfiles.com/ugd/3826db_4e3ce2aa8f8b436884c407d7f36b0c3d.pdf
    • https://static.usrfiles.com/ugd/405339_d2f3cc64bc2846de9a0a801530339395.pdf
    • https://cdn.shopify.com/s/files/1/0435/5971/4971/files/97030392968.pdf
    • https://cdn.shopify.com/s/files/1/0450/8984/9509/files/purpose_driven_life_day_9.pdf
    • https://cdn.shopify.com/s/files/1/0436/1843/5229/files/smart_fortwo_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/4176/7072/files/video_show_application.pdf
    • https://cdn.shopify.com/s/files/1/0429/3446/8774/files/lesugaxowotugu.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_off00006bef.bin
a01b728bfa2592d8bc2a3c3eed8dd2c2f2bb3f206989f353eb70e940f511c6fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 4868 bytes
font_01_sfnt_off00007c97.bin
3a0c1bbbaa59c738081c7ef8787f088155b58ff36571254fb042e0fa06f6a298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C97 10044 bytes

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