Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b5803b92f95b39…

MALICIOUS

PDF

51.4 KB Created: 2020-08-13 22:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69d460671dcd2f8cc88a941f32824495 SHA-1: e605a62e338d0fccdee2fe72c6aa45e3f2cf7575 SHA-256: 11b5803b92f95b39ca0c475a7f8d962ac9e9b0ce69331b6640bbc792e3326756
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One prominent link, 'https://ttraff.com/pify?keyword=boot+usb+asus+transformer+t100', is identified as a malicious redirector. This suggests the document is designed to lead users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also strongly indicated maliciousness.

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=boot+usb+asus+transformer+t100
    • http://files.ganetsinai.net/uploads/1/3/1/4/131406344/3f85896e2d3.pdf
    • http://vanisal.supplementbottles.com/uploads/1/3/1/4/131406286/4314779.pdf
    • http://files.littlesilverems.org/uploads/1/3/1/6/131606003/nelos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/38190088348.pdf
    • https://cdn.shopify.com/s/files/1/0435/4126/6587/files/34342919625.pdf
    • https://cdn.shopify.com/s/files/1/0431/8927/2725/files/infarctus_du_myocarde_ecg.pdf
    • https://cdn.shopify.com/s/files/1/0437/8014/5313/files/85330526650.pdf
    • https://cdn.shopify.com/s/files/1/0434/4794/3330/files/further_mathematics_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0437/4737/7301/files/sebudone.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/26680312876.pdf
    • https://cdn.shopify.com/s/files/1/0430/8680/7201/files/50821909711.pdf
    • https://cdn.shopify.com/s/files/1/0432/7686/1606/files/dajaboxituvupalonik.pdf
    • https://cdn.shopify.com/s/files/1/0433/9980/7126/files/83934505153.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/vevakabizunudogotofigu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000753b.bin
6515e47bbc417571c9f37848bbdba788cf8a05659918782eb41d89e177321619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x753B 5264 bytes
font_01_sfnt_off00008710.bin
6f7f3acbd23bf6ba986e0dbc85f2834c425f6436e2af8c67bab844af3544dfc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8710 10140 bytes
font_02_sfnt_off0000a9fb.bin
eb1d96507c75f76fc1870ba6ec6ff391906c8d1fa0d52e1aeb732700364bdf32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9FB 16436 bytes

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