Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2124c3896db116…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 23:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c485fe0c6dd8057bab564732339a5b40 SHA-1: b6863e701b20ea222152e0e290f2b8d2a4cf9df7 SHA-256: 0c2124c3896db116c57b8876e998633bce840c77ef4c3269ab3628638175a2f6
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=oxford+collocation+dictionary+premium+apk'. This URL is presented within the document body, disguised as a download for a premium application. The presence of numerous other PDF links, many pointing to benign Shopify domains, suggests a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=oxford+collocation+dictionary+premium+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7633/7318/files/emotional_intelligence_book_review.pdf
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/hermansky_pudlak_syndrome_case_report.pdf
    • https://cdn.shopify.com/s/files/1/0438/7104/3739/files/91022202719.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4664/files/dolor_nervio_ciatico_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0438/2153/1293/files/batho_pele_principles_department_of_education.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4255/files/vofokifadupuwog.pdf
    • https://static.usrfiles.com/ugd/0511f5_5f542d3ae9344dd4acdf078c4618424f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a102dd05cd640c09c166b36a8101432.pdf
    • https://static.usrfiles.com/ugd/8b2c09_8f09ee97cf154eb1b4b60372baca08db.pdf
    • https://static.usrfiles.com/ugd/b48b60_ca6bab8649fe4c58a0cf16cbc7730ffd.pdf
    • https://static.usrfiles.com/ugd/f55bec_0aa74683287744c99e30cb13f2bf3298.pdf
    • https://static.usrfiles.com/ugd/b8c837_bd1a8274c51f454a8fef573f351975b6.pdf
    • https://static.usrfiles.com/ugd/d2751c_cbc38da888c24e50957f600a7079186c.pdf
    • https://static.usrfiles.com/ugd/271e65_6020c07ad2ea422c80edd836bb86e292.pdf
    • https://static.usrfiles.com/ugd/122077_02c4649dc6ac423699ca2a4f84e83a94.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_off00006b55.bin
fc2691eaf20d6d43f56d45b9861d1a54689bf26b5f552e657e8056716cb76136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B55 5384 bytes
font_01_sfnt_off00007da4.bin
1371b4147dc5feae4156f190998545f5e47054ed1d271f4095da60c61e11310d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA4 15528 bytes

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