Malicious PDF — malware analysis report

Static analysis result for SHA-256 0820457492821401…

MALICIOUS

PDF

56.2 KB Created: 2020-08-31 16:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff287f9e7f6d320b7a1600ac11e76cb2 SHA-1: 1f15f0fec30dbb45931c95b9c82790e1ef3be172 SHA-256: 082045749282140124e55d773c16f8399ab5805f2372f1f4758271cc9c6354dc
162 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector URL, indicating a phishing or scam attempt. The document body and heuristics suggest a lure related to exam papers, with a clear call-to-action to download or click. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, some pointing to benign Shopify domains and others to potentially malicious infrastructure, supports this assessment.

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.com/wix?keyword=bitsat+2017+question+paper
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0435/4660/7765/files/chairmanship_honor.pdf
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/18865753411.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/seruso.pdf
    • https://static.usrfiles.com/ugd/fa6f14_9ec2f0701af042629bd4597c49738184.pdf
    • https://static.usrfiles.com/ugd/277b62_e10a516b36b74c6cb4da4e2cc14452a9.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_0ea1c569997742169e0d73e7120a89ec.pdf
    • https://static.usrfiles.com/ugd/f65175_0420b36ead6446e3825960c1a23132b5.pdf
    • https://static.usrfiles.com/ugd/52b593_26781be5733b4c6e9666a31165a8f186.pdf
    • https://static.usrfiles.com/ugd/b56239_2db62c3199b94680b6b76eaee12292d2.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/salanokimumotiwis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/92161478626.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/lunch_time_cypher.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0710/files/69340759045.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1651/files/nodame.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa8.bin
158af206b7fecb27035bc6dcfa2f5c43188582c52188be4f1b17971f217978e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA8 5360 bytes
font_01_sfnt_off00007cfc.bin
d0d68c664b8f1e00a7fc92cfda46a434e83ce87f866bdd1c3f12956b581bc36f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFC 5648 bytes
font_02_sfnt_off00008cbc.bin
c9082be4f623ec1357f7371e97f1991ffbe78a313c7c741ff19eb5ae7f6214b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBC 10352 bytes
font_03_sfnt_off0000b055.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 16224 bytes
font_04_sfnt_off0000c5dd.bin
10ffeadecc7c453165f268265ace65a52f2cd0069fb6fa4ab8e144d5892caf09		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 3420 bytes

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