Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed1a73290d99aa8…

MALICIOUS

PDF

36.9 KB Created: 2020-08-19 22:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b037199309eec71eef73de2677c866c7 SHA-1: 20e74b02e832d50f2f3c2d9b7beba342c3cfb587 SHA-256: aed1a73290d99aa8b7b9a40609852d5ef23417d2616f0067b1c7bfb792899c12
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a Bihar board marksheet, which is a common lure for phishing or malware delivery. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The PDF also contains a large number of external links, as indicated by PDF_SEO_LINK_FARM, suggesting a link farm for SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/pify?keyword=bihar+board+marksheet++2011
    • http://govov.parkhillcc.org/uploads/1/3/1/4/131409474/1603b.pdf
    • http://files.ubrjhfd.com/uploads/1/3/0/7/130775598/6672561.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2086/files/2163118488.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5263/files/zojajedebekabiruti.pdf
    • https://cdn.shopify.com/s/files/1/0433/1477/4169/files/85613244924.pdf
    • https://cdn.shopify.com/s/files/1/0447/9824/7069/files/equanimity_texture_pack.pdf
    • https://cdn.shopify.com/s/files/1/0437/3354/9205/files/surah_yasin_full_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/lobememoxewi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/wirakedus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/catalogo_mary_kay_marzo_abril_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/8308/6489/files/139708007.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/fepawuroxetop.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/75555228479.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000515e.bin
14453125cbdea9961ee096532605004087dab1954c20b84710d9f572f4df9250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x515E 5612 bytes
font_01_sfnt_off0000644c.bin
e397f24b89ec3b377051c2f8adfc9c5d3e9a32d6d5cdccde2e552977c18d99fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644C 10200 bytes

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