Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a68dacd1ac62704…

MALICIOUS

PDF

53.7 KB Created: 2020-08-03 19:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2920f8326e103444bad3b5bf32beeaf SHA-1: 09248fdcbf52b4451e529ca6e4196a7ec4c40ba6 SHA-256: 0a68dacd1ac62704459f3a9b8f539ee9fe91ed37a6ec30cd1e9c99b498b4ffa3
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a syllabus. This suggests a phishing attempt where the user is tricked into clicking a link that leads to malicious content.

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.cc/pify?keyword=cbse+class+12+chemistry+syllabus+2020+20+pdf+download
    • http://files.rpskillsunlimited.com/uploads/1/3/1/1/131164081/gokebolu.pdf
    • http://files.stanthonyschoolsg.org/uploads/1/3/0/7/130739419/cd9140f865.pdf
    • http://files.atouchofcolorbytamilee.com/uploads/1/3/1/0/131069875/punododiduxujori.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/35187974166.pdf
    • https://cdn.shopify.com/s/files/1/0429/8693/0329/files/punupofu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/56449571764.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/tabetikonibobuzibenuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6713/8470/files/61719440714.pdf
    • https://cdn.shopify.com/s/files/1/0434/4935/2349/files/runijunazoxamit.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/lekurabamu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0011/files/nagejalezuwizir.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3464/files/98822010489.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/runumatiginofokapekaf.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/36000083526.pdf
    • https://cdn.shopify.com/s/files/1/0428/9354/1535/files/92083322767.pdf
    • https://cdn.shopify.com/s/files/1/0434/0042/9731/files/33010165116.pdf
    • https://cdn.shopify.com/s/files/1/0440/0391/7974/files/sokigiwepilafidex.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066ab.bin
dd1bfe31c7e7633c5b31a3c0ab7179276479b3c2838cabcacbe28835e947c682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AB 5960 bytes
font_01_sfnt_off00007ad7.bin
b3ec26f27008b279be7fab92192b801d8c67667ee6ab98fcd8b1d8d65b4e37a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD7 6164 bytes
font_02_sfnt_off00008c0c.bin
a2e64223c933e1ba4909f1c037513441e7e66074b663f17f2981da253f6b484e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0C 10284 bytes
font_03_sfnt_off0000af57.bin
dae21f5a37ae9460119d87f8c9cff400b9ea70d6c0184163235e92195f9afbc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 17492 bytes

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