Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e7db4f34df0d63…

MALICIOUS

PDF

61.3 KB Created: 2020-08-30 09:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95255a2dd64060613b5d1c39e6e8c2b4 SHA-1: 1aaee34dfb5f1c6fa3791c4ca7e7adbdc8f33846 SHA-256: 62e7db4f34df0d6329c6b1f1a0ac49f522b8bce59e9d82df2f4519dcf4c5ce70
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files, indicating a link farm strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=spring+heeled+jack+assassin%2527s+creed
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/regression_analysis_by_example_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/exercices_corrigs_sur_amplificateur_oprationnel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30740110423.pdf
    • https://static.usrfiles.com/ugd/b8c837_79c122cbb9e543bfa8fee33298bd20e3.pdf
    • https://static.usrfiles.com/ugd/3e87bf_002787f758b34c07a6d0e51bff370539.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b71d75ab8ef4596b2a344b295b1484e.pdf
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/gebomozebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/multiplayer_shooter_games_for_android.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_off0000b37d.bin
74b24f7471d8eef88ebdc1a5cd3db0caeba7351318af23fefa3919a7534c1212		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 5612 bytes
font_01_sfnt_off0000c68e.bin
e642ef3912018ba1de63a3cfa23f962272b4fcad1f7e354455378504b309040b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 10024 bytes

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