Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abb66d6eb70ea93…

MALICIOUS

PDF

61.4 KB Created: 2020-07-30 04:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcad06eb547d1455583a4bfc592a8297 SHA-1: 84ce3b26877f7ef1b1e596d2079845e9ff024b1d SHA-256: 0abb66d6eb70ea93f235c48a7a34ae3aa137b9c0ffe732fc9af94dbb2a3c97d4
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a syllabus that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document as malicious with high confidence. While no scripts were extracted, the presence of a malicious redirector suggests an attempt to download further malicious content or lead the user to a phishing site.

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=bharathiar+university+bcom+ca+syllabus+pdf
    • http://files.sweetnnaughty.ca/uploads/1/3/2/8/132815318/ce0cb.pdf
    • http://files.maysclub.org/uploads/1/3/1/6/131636855/993968.pdf
    • http://files.inclusive-arts.com/uploads/1/3/0/7/130775974/7c671a6190cc1c0.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5908/files/33446437562.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/80499566395.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/xujavosisako.pdf
    • https://cdn.shopify.com/s/files/1/0435/4647/6708/files/97532485012.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9893/files/61198890762.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/46580996706.pdf
    • https://cdn.shopify.com/s/files/1/0436/5054/7870/files/batefunoripum.pdf
    • https://cdn.shopify.com/s/files/1/0433/2938/8699/files/puvudajenerojewizigole.pdf
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/19359623036.pdf
    • https://cdn.shopify.com/s/files/1/0439/4532/8808/files/32209065584.pdf
    • https://cdn.shopify.com/s/files/1/0430/0029/9683/files/45877047278.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0000d60a.bin
d97377089687a897bcbb3d5a4fe925d3a744eb41ac3d39caf3ea2337d638fc3c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD60A 4628 bytes
font_00_sfnt_off0000763a.bin
5b43e5dee4276598ddb75a65809ed3bb49b57429e38f744e6cc96d8da14da486		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763A 5628 bytes
font_01_sfnt_off0000892c.bin
d97e055e11de589539a249dfdf9c15aca1e9caf4700104d1763a3a5d87d8f7f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x892C 2320 bytes
font_02_sfnt_off0000937e.bin
5166c9f7b1b2dbeba718d4a2b7ecfab502eb59a3248cffebd709e21682418034		 pdf-font-stream PDF embedded font (sfnt) at offset 0x937E 14456 bytes
font_03_sfnt_off0000c082.bin
207faf14306426b668b87aba0c9d447b8ba40b67f0f7b18660ffa0d3c8132265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 16224 bytes

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