Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb3a4f729a1651b…

MALICIOUS

PDF

39.9 KB Created: 2020-08-11 06:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 175359777e1e9aff68e108c3a983a96d SHA-1: 8ba46176a1401a329c0fdb4cf042e7eb7bb90c22 SHA-256: 9bb3a4f729a1651bbbf19df86ab5da1f3add078c9a76a011633d431cc2804328
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector link. The document body, though heavily obfuscated, contains text related to 'Beginner violin book pdf' and includes the malicious URL. This suggests the PDF is designed to trick users into visiting a malicious site by appearing to offer a legitimate resource.

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/wb?keyword=beginner%20violin%20book%20pdf
    • http://files.pontolaketownship.com/uploads/1/3/1/8/131857419/sisewipe.pdf
    • http://files.immortalsonearth.com/uploads/1/3/0/8/130813120/f8f81e6a1a033.pdf
    • http://files.georgiefaircloth.com/uploads/1/3/1/4/131453793/roxekudaverisese.pdf
    • http://files.luxurytophomes.com/uploads/1/3/1/4/131454221/9446329.pdf
    • https://cdn.shopify.com/s/files/1/0430/6901/4165/files/42043010211.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/46829522797.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/10435046215.pdf
    • https://cdn.shopify.com/s/files/1/0432/1830/5179/files/92194136852.pdf
    • https://cdn.shopify.com/s/files/1/0432/8439/8246/files/kreyszig_introductory_functional_analysis_with_applications.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/exercise_and_cardiovascular_health.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/assembler_plusieurs_images_en_1.pdf
    • https://cdn.shopify.com/s/files/1/0428/5110/6972/files/15755423935.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/xubosujivavuvazixabomirix.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_off00005d7a.bin
87392fb6fc880d8d7db7a7efba86b683099b3828efa04b1550275011b34283d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7A 5132 bytes
font_01_sfnt_off00006f05.bin
4e174c0559b15d903f4f9d933d8718ef7840fb4035cb8d2d8352f7a7860a0967
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F05 10620 bytes