Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef4414d5ac165b5…

MALICIOUS

PDF

49.1 KB Created: 2020-08-08 11:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a253a5a6b8e6c49a89cbeb82941d4090 SHA-1: a869f6ed74b8b6f7b752ccd264ac530cabb0378a SHA-256: 5ef4414d5ac165b5f23b3a2f461adb82805d493fd21d81a8a91d8d0bbde3c6ef
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the URL https://ttraff.com/pify?keyword=pulse+oximetry+principle+pdf, which is a primary indicator of malicious intent. The ML_NYX_PDF_MALICIOUS heuristic further supports the classification of 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/pify?keyword=pulse+oximetry+principle+pdf
    • http://files.creativecircles.shop/uploads/1/3/0/7/130775384/xegorojesarorotagol.pdf
    • http://files.fieldtripfever.com/uploads/1/3/1/6/131606782/5514551.pdf
    • http://files.sandislandtennis.com/uploads/1/3/2/6/132682640/c5e89.pdf
    • http://files.dogspeakllc.com/uploads/1/3/0/9/130969494/xetepazilarajatekin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/podirojunewixemumatisajo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/encyclopdie_du_chocolat_pierre_herm.pdf
    • https://cdn.shopify.com/s/files/1/0434/2556/2791/files/29951753841.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nunirisolifugonogebivaxez.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/autumn_in_my_heart_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/37124666802.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/linuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/happy_birthday_piano_jazz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8774/8519/files/aviculture_en_zone_tropicale.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/raxerijotolananamidi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000823d.bin
af1f2efcec775112036544704208f78ff732d8a2bef0d0fc4333754407477ef1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823D 5264 bytes
font_01_sfnt_off00009422.bin
3ee6abf163c0571370ef2b9631ebcfbc8b8deee0ef0e3fac94d4bd3995d578c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9422 10452 bytes

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