Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c9273f9bc7bd5b…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 13:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9590a9485137fafa5e77d2e170b990f6 SHA-1: 4634461178ade86bfe8f53a6d4fd14e4dddc01ee SHA-256: 08c9273f9bc7bd5be26bcc14f86cca0198d4f0b7a9ecc3111df32625b3db2759
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, which is a strong indicator of malicious intent. The presence of a "download button" lure further supports a phishing or scam attempt. The document body, though heavily obfuscated, contains the malicious URL, suggesting it is the primary payload delivery mechanism.

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/pify?keyword=april+2020+current+affairs+pdf+adda
    • http://files.wmgamebirds.com/uploads/1/3/1/4/131453907/1615128.pdf
    • http://files.hosthomescowichan.ca/uploads/1/3/0/9/130969315/lolapex.pdf
    • http://files.strengtheningtransitionsincare.com/uploads/1/3/1/4/131438188/27769c.pdf
    • http://files.haraequine.com/uploads/1/3/1/4/131407047/gamalisamejunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0357/5454/files/66198681626.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/wezadu.pdf
    • https://cdn.shopify.com/s/files/1/0440/6748/7894/files/arguing_about_literature_a_brief_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/6504/0286/files/sobelurejavemeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/18417334746.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/negojuzivonisebasoso.pdf
    • https://cdn.shopify.com/s/files/1/0434/2611/9847/files/diy_electric_power_steering_conversion.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/75358831466.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/26679065097.pdf
    • https://cdn.shopify.com/s/files/1/0435/3831/7464/files/84038788085.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/9351693449.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_off00006014.bin
61eb0b10ffeaa6e79e861090513efe07c86eae387b463a1a968116a4d1194757		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6014 5412 bytes
font_01_sfnt_off0000728b.bin
59430f2713efc09e419698c9fc354770273cb765d976cc483c1aed34282adb1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728B 10180 bytes

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