Malicious PDF — malware analysis report

Static analysis result for SHA-256 f925da7294947065…

MALICIOUS

PDF

44.6 KB Created: 2020-07-21 09:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c4061f3bdeec372abb9a954596c684 SHA-1: 922247214dae181f845f0aeac5e7c6dd3b6ca72e SHA-256: f925da729494706500fc03327ebc1c52b8e764832b1c7acd4567669aab49fe51
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.com/wb?keyword=amazing%20grace%20free%20piano%20sheet%20music%20pdf`. This URL is part of a link farm designed to host numerous PDFs, as indicated by the `PDF_SEO_LINK_FARM` heuristic. The document body, though heavily obfuscated, appears to contain text related to sheet music, serving as a lure. The ML classifier strongly flags this PDF as malicious.

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.com/wb?keyword=amazing%20grace%20free%20piano%20sheet%20music%20pdf
    • http://files.kinellarhall.com/uploads/1/3/1/3/131379246/zujevorepolubepek.pdf
    • http://files.roseworksconsulting.com/uploads/1/3/2/7/132740594/2303405.pdf
    • http://files.bodyandmindsolutions.com/uploads/1/3/0/7/130739895/7725655.pdf
    • http://files.bodyandmindsoluti
    • https://cdn.shopify.com/s/files/1/0432/4484/7261/files/fasozurogupukuxor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9380/files/fesazavugepimigokediv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5959/2859/files/33886340939.pdf
    • https://cdn.shopify.com/s/files/1/0435/3989/0327/files/33811575615.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/vuxopogovugafirezaruf.pdf
    • https://xoxufasi.files.wordpress.com/2020/07/10315445208.pdf
    • https://zisagan.files.wordpress.com/2020/07/30626685360.pdf
    • https://bimirofi.files.wordpress.com/2020/06/92654975355.pdf
    • https://dukubosibi142438368.files.wordpress.com/2020/06/23415519272.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/93072698762.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/7047675757.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/xisatuwekigulizofev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/files/vugawemebejolopodenovaxo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/86805899578.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/60713697790.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.pdf
    • https://cdn.shopify.com/s/files/1/0429/8942/0695/files/jukiliwapedizaluf.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_off00006f27.bin
2974a59b0d162ba7dec1ddde3b7ed5515b14fffa10f4b519fd370e9cfb68cabe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F27 5460 bytes
font_01_sfnt_off00008184.bin
5ff2a2aa6e4fdb430d63485dc7301d01aa842bb255a119e33e2afccb2eae4ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8184 10440 bytes

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