Malicious PDF — malware analysis report

Static analysis result for SHA-256 7896498385063071…

MALICIOUS

PDF

38.9 KB Created: 2020-08-29 05:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cb6ab3a7cf4cb44809e48b2548df828 SHA-1: 9bd5db0182f6d2c173273333f94888a29fd62c9d SHA-256: 78964983850630712bc24be890b3afe97d71e2ad50175f897d972f8b3466cb9c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/wix?keyword=download+silent+solitude+mp3. The document body also contains this URL and a large number of other PDF links, suggesting a link farm or redirection attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link indicate a phishing or redirection attack.

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=download+silent+solitude+mp3
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/38282406874.pdf
    • https://cdn.shopify.com/s/files/1/0463/1943/5936/files/geguvekowenudowo.pdf
    • https://cdn.shopify.com/s/files/1/0437/4685/3016/files/cuneiform_script_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/3489/4755/files/android_studio_image_asset_not_working.pdf
    • https://cdn.shopify.com/s/files/1/0438/8667/4088/files/cadver_exquisito_agustina_bazterrica.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/89362141698.pdf
    • https://static.usrfiles.com/ugd/b8c837_8710bf324c504b959ff9e2889b435479.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cbd3c4a973d4b1e9c0ac76c9a720fcc.pdf
    • https://static.usrfiles.com/ugd/b8c837_22369135569249eba7d94d423d4ad4c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a63028323c847d08fe0f16678de305c.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004233.bin
533ac20a53483c545858c4f081ed24d865e0416b093344712c7d01ea0b215ce3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4233 4036 bytes
font_01_sfnt_off00005086.bin
81a60f348345930181c0b7ed38f5f88b19205cdf1cb9852a83f479e33a8095c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5086 5264 bytes
font_02_sfnt_off0000626c.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626C 1800 bytes
font_03_sfnt_off00006afa.bin
f729ed099000979c766e5aee02fb2cd561dcb308ec24b0337dc3ae96b1c5a44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFA 10548 bytes

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