Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c71099535b8d3e…

MALICIOUS

PDF

97.3 KB Created: 2020-07-30 18:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5792f2dd50f3eedf3864e3cfc77a6a9c SHA-1: 555b3dd867d2226af09b35be7b76cb2fd84b7aca SHA-256: 77c71099535b8d3ef5e63e32ab506accd8d2a3a8241489e17b040ce29752be68
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically `https://ttraff.com/pify?keyword=amar+ujala+dehradun+epaper+pdf`. Additionally, it features a 'download button' lure and a large number of external PDF links, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.com/pify?keyword=amar+ujala+dehradun+epaper+pdf
    • http://files.fearnotministries.com/uploads/1/3/0/7/130776402/618120.pdf
    • http://files.eurocastanea.org/uploads/1/3/0/7/130738841/jixefewime.pdf
    • http://files.tonchairs.com/uploads/1/3/1/4/131437530/pozegavusabixu-xudefidujine.pdf
    • http://files.rachelsouthart.com/uploads/1/3/0/9/130969172/pobusajakev-vupiluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/0161/8330/files/lezukujoriv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3861/files/pibesotagolotidusomezozos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/5759901314.pdf
    • https://cdn.shopify.com/s/files/1/0429/3532/0735/files/fagovosuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobirunutopuwipigodilig.pdf
    • https://cdn.shopify.com/s/files/1/0438/2438/2114/files/giduvoxen.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/19192754251.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/52905364252.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6449/files/tefakakixivezilugita.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1600/files/83646768017.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/22836566327.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/59324016115.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faf1.bin
2660a51a448bcb30c2eda9d02f56bac19c11a31f5dbe163e5ff2df05b7473541		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF1 4812 bytes
font_01_sfnt_off00010b14.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 3720 bytes
font_02_sfnt_off00011677.bin
3543cd08a764640f7b3f374d0cbfd56e9156ae6212a9da9a858a8d6912281c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 15496 bytes
font_03_sfnt_off000146de.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146DE 16164 bytes
font_04_sfnt_off00015c2f.bin
344a58d7d195b755047cdb1e6353d574f7bc12295087dd939e84e2af20d0e50c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C2F 7908 bytes

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