Malicious PDF — malware analysis report

Static analysis result for SHA-256 1591ce17389413ed…

MALICIOUS

PDF

48.0 KB Created: 2020-09-01 04:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ee4ff75c8c9b24462798d8c73049b66 SHA-1: fe80eacbece84674824dff563a374fcf1e1bb0d6 SHA-256: 1591ce17389413ed6fbd62687cd7534fb4612170f6fbae217c98cfdfbf3a710e
94 Risk Score

Malware Insights

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

The PDF contains an embedded URL that is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL, suggesting it is the primary mechanism for luring the user. No scripts were extracted, but the presence of a malicious redirector is sufficient evidence of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cpr+2019+study+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_cc2e7c4f07fd409684e382ff3e9e542b.pdf
    • https://static.usrfiles.com/ugd/defdb4_b152fa1c315947c6984e97d0c1121d63.pdf
    • https://static.usrfiles.com/ugd/b8c837_25286c4c53824c33bd323f6e63ff0e53.pdf
    • https://static.usrfiles.com/ugd/067ecb_94156076db6641e6a5d5c70428eda3dd.pdf
    • https://cdn.shopify.com/s/files/1/0431/9235/2931/files/61609721290.pdf
    • https://cdn.shopify.com/s/files/1/0433/7218/3703/files/barron_s_sat_math_2_book.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae4eb19d174747cc8ed32291d4908846.pdf
    • https://static.usrfiles.com/ugd/b7ab08_5a518c4d594747869247acab76e858b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bb815f7052643ddb9520f07d89f548e.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000992a.bin
d2d1e2bd902aec74df429616b07dab66dcfc02fc5c41a9b1e499dbb6f43353b8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x992A 17684 bytes
font_00_sfnt_off000063eb.bin
3b5f72c721f443065c65d0defd5a8f14de0ed308a2b25d607c3a6750b11f3e0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 5372 bytes
font_01_sfnt_off0000764b.bin
e4a4225b99ab33060eae658d0f23fee68689277d5e855044c37218dce0be9be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764B 10120 bytes

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