Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ba2c1ae624ea22…

MALICIOUS

PDF

42.8 KB Created: 2020-08-21 17:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7bbf5d3d6c423d6c436ada0918caa6b SHA-1: afe5d40dd00cecf840282aa22d8e6e964c9a2206 SHA-256: e9ba2c1ae624ea222c3a5ae31dbd9ddd303877f8cc1c12be82c6b0af4e15ea30
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, constituting a link farm. One of these links, https://ttraff.ru/pify?keyword=jasper+report+template+design, points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=jasper+report+template+design
    • http://files.asqfortworth.org/uploads/1/3/2/6/132681836/7679024.pdf
    • http://files.manaleimedia.com/uploads/1/3/0/7/130740213/9849762.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/filmora9_video_editor_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/miwazinajibalugatalotifon.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9858/files/31620308938.pdf
    • https://cdn.shopify.com/s/files/1/0436/6719/4021/files/99556634591.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/koruvurojira.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/65667266273.pdf
    • https://cdn.shopify.com/s/files/1/0434/2553/0005/files/94323966153.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/72638074058.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/61286624564.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/distress_tolerance_worksheets.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_off00005e44.bin
b2781995f303eeaf9be2c8f932997343d1d5d76a2e0d3680c11751464885e6c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E44 5268 bytes
font_01_sfnt_off00007015.bin
423274dd6ad4fae9973dca88fcbabd6e0173b05e4b323bd141aba6e7447d30d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7015 15180 bytes

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