Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1065f9805fbda3…

MALICIOUS

PDF

46.2 KB Created: 2020-07-31 11:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4d42072c545a80f1da512472da8c94 SHA-1: 6fb2e1df216dadfa1f55f05c50e9b589fa081b73 SHA-256: df1065f9805fbda3ed25ffd0ece090adaedbe8fdb4000638275027e0516846c0
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=difference+between+pure+and+applied+research+pdf`. Additionally, a PDF link farm heuristic indicates the presence of numerous external links, with the primary one being `https://cdn.shopify.com/s/files/1/0433/9249/9877/files/22083411405.pdf`. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=difference+between+pure+and+applied+research+pdf
    • http://files.moonlightgrahammusic.com/uploads/1/3/1/6/131637797/kofazegesig-sakapagogubad-pulagurigoriz.pdf
    • http://files.willrobinsonauthor.com/uploads/1/3/1/8/131871568/xatofijekorawijajoru.pdf
    • http://files.leandremeldener.com/uploads/1/3/0/9/130969190/3481642.pdf
    • http://files.moonlightgrahammusic.com/uploads/1/3/1/6/131637797/kofazegesig-sakapagogubad-pulagurig
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/22083411405.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/11988068269.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/64430892349.pdf
    • https://cdn.shopify.com/s/files/1/0432/9318/0070/files/76261913173.pdf
    • https://cdn.shopify.com/s/files/1/0430/9290/2037/files/wemuziredupo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9814/files/jilevopo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5551/2738/files/vijenipelixozadisuxojuki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0727/files/94140919223.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/vixopukotugemubojis.pdf
    • https://cdn.shopify.com/s/files/1/0427/4293/9814/files/89460267336.pdf
    • https://cdn.shopify.com/s/files/1/0437/3735/0309/files/2606424629.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_off0000770b.bin
6d5f614753d9b08901f2fbecf8b95d71176355ef91ce2c3cbd8f07cf154d0c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 5244 bytes
font_01_sfnt_off000088e1.bin
1a195d2054da0d149ccb32a759bc6b893d7322824441662213ba9e3cb92c4dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E1 10032 bytes

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