Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cb399e84030e33…

MALICIOUS

PDF

46.4 KB Created: 2020-08-08 17:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41cd6cc610c148a43fbd3d3a1a79046c SHA-1: 158e924dfae45968d29e4fcf9de4ced224143619 SHA-256: 04cb399e84030e33a6a2a55445856fc0a055e59c2ca7ee06659e01006f7f8974
162 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to benign Shopify domains, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=mathematics+formula+pdf+for+competitive+exam+in+bengali', which is flagged as a malicious redirector. This suggests the document is part of a phishing or scam campaign designed to lead users to malicious sites.

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.cc/pify?keyword=mathematics+formula+pdf+for+competitive+exam+in+bengali
    • http://files.valancourtbooks.com/uploads/1/3/0/7/130739298/8339197.pdf
    • http://files.gracechasers13.com/uploads/1/3/2/8/132814898/34aa392821f204.pdf
    • http://files.aquarianlibrarian.com/uploads/1/3/1/4/131406807/e19f8cc22a300d.pdf
    • http://romup.owenashton.com/uploads/1/3/1/3/131379730/4786774.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/albert_schweitzer_biography.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/96670008310.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/30648625836.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/6025741694.pdf
    • https://cdn.shopify.com/s/files/1/0433/5337/4874/files/43836686009.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/66633726330.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/7485095273.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1699/files/code_academy_css.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/88099002456.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/58099460142.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/tixoniwobo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/79769357035.pdf
    • https://cdn.shopify.com/s/files/1/0434/0373/9294/files/85390344773.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004cb5.bin
8d410dc8a97715dd16ae2fcc3cb6c2aa95fd52db10df83b588500d40c4b91a44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB5 5844 bytes
font_01_sfnt_off0000607e.bin
934059665de4f686869fb33bc0faaf0e4dab2a89ca3c8f63eaca3cdebd553145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607E 6424 bytes
font_02_sfnt_off00007542.bin
666df3a56148dd7d4865e8c96c41aa74e05bd1f87d599fb09e856f8dd8e82b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7542 9724 bytes
font_03_sfnt_off0000967e.bin
28d5afbff6c2e9e687c0d9657fc0c8653379f131105490b33dc0c12c71f72ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967E 16080 bytes

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