Malicious PDF — malware analysis report

Static analysis result for SHA-256 65db83da0f96ab05…

MALICIOUS

PDF

45.8 KB Created: 2020-08-13 09:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36a79ae06e579bf6d13a29fb775b2c9d SHA-1: 2cd92606a23303ed5bce37bd41d6bd8b8c134629 SHA-256: 65db83da0f96ab05f91c84dfaee0d9c340f23995a0c27e04d15f2b5f57f8fbc0
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to benign Shopify domains, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/wb?keyword=ignou%20b.ed%20entrance%20exam%202019%20pdf', which is flagged as a malicious redirector. This suggests the PDF is designed to lure users into clicking the malicious link, likely as part of a phishing or scam campaign.

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/wb?keyword=ignou%20b.ed%20entrance%20exam%202019%20pdf
    • http://files.tillylunken.com/uploads/1/3/2/7/132710690/lugatapowubofogamud.pdf
    • http://files.mendedwingtheatre.com/uploads/1/3/0/7/130739398/vanare-gekirux-watubavol.pdf
    • http://libut.caraday.me/uploads/1/3/1/4/131438405/nepijajezisazibusok.pdf
    • http://nuxotote.stephenlemons76.com/uploads/1/3/0/9/130969744/8231981.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9809/5272/files/15759406237.pdf
    • https://cdn.shopify.com/s/files/1/0434/3896/4903/files/13726633610.pdf
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/fevabijubugusugatudagulax.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/bibomikibawema.pdf
    • https://cdn.shopify.com/s/files/1/0435/1174/2628/files/wutor.pdf
    • https://cdn.shopify.com/s/files/1/0436/4389/5958/files/81415588423.pdf
    • https://cdn.shopify.com/s/files/1/0448/2924/5600/files/miwinomasifirijaremexis.pdf
    • https://cdn.shopify.com/s/files/1/0437/2765/0970/files/25603246242.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/73423949406.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/1555196304.pdf
    • https://cdn.shopify.com/s/files/1/0432/7620/6240/files/lufesidimerixobakaxeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2086/files/gidivezimopebixoxejogami.pdf
    • https://cdn.shopify.com/s/files/1/0440/0565/4678/files/both_and_either_or_neither_nor_worksheet.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_off000072e6.bin
251fd486092f76b11241c2d7705bd95a35e59f4b24db2d5e9fe1ecc3155230cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E6 5924 bytes
font_01_sfnt_off00008709.bin
22394e03313e315e75b0f5fc494b1ed47381b1758d86a3935998f63736fb3da6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8709 10272 bytes

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