Malicious PDF — malware analysis report

Static analysis result for SHA-256 075063741612c711…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 19:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97a5f3d2b5590737f588abb76bcdcaeb SHA-1: b03fd356f1bfa67dc46ce5c35ef5f824925ccf4c SHA-256: 075063741612c7116db42eff0cb6f2f1b234fc0d0e2a23e6d9b85c29235d801b
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead users to harmful content. The document body, though partially corrupted, contains the text 'Grammar and writing practice book grade 3 pdf' and the malicious URL 'https://ttraff.ru/pify?keyword=grammar+and+writing+practice+book+grade+3+pdf', suggesting a lure for a malicious download or phishing attempt. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=grammar+and+writing+practice+book+grade+3+pdf
    • http://temudupe.venezuelanscryforfreedom.com/uploads/1/3/0/8/130815017/diruk.pdf
    • http://files.lifeofchristrosary.com/uploads/1/3/2/6/132695633/femorubizabafopo.pdf
    • http://files.hetztronics.co.uk/uploads/1/3/1/3/131380120/kipowul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/flv_downloader_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0427/7652/7014/files/17603374696.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/16313383445.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/30210008288.pdf
    • https://cdn.shopify.com/s/files/1/0439/9919/9390/files/cds_2020_result.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/60491884771.pdf
    • https://cdn.shopify.com/s/files/1/0427/9920/2467/files/dajofan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8461/9680/files/42038109697.pdf
    • https://cdn.shopify.com/s/files/1/0431/4677/2646/files/46446036201.pdf
    • https://cdn.shopify.com/s/files/1/0433/0989/1742/files/46005805007.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fef.bin
6de4910e1a101e3987fcfe3bb12c29acd02eb2a150722326fa4ecba538612e6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEF 5536 bytes
font_01_sfnt_off00006316.bin
0d0dc7b88b6830cb59f54d8131cd1c8858f2328de5f07b8c5c8b0c2c0f1d4c57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6316 5756 bytes
font_02_sfnt_off000076b0.bin
7af85db9baa698f60b71d4826ea6c137f179c65f2b5b524a3d36ee2db017fbe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B0 10140 bytes

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