Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef7ea1a6cd50d83…

MALICIOUS

PDF

57.2 KB Created: 2020-08-14 14:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffacdacd5e3e8f5e2afec783cf1e764f SHA-1: 56867103e27e7d611cd3dca33c2341b4cc106ace SHA-256: 5ef7ea1a6cd50d839b83da6dcb2ae7bdef29c9b063c0c7814d650a5c78bfcb25
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary URL `https://ttraff.com/pify?keyword=ayatul+kursi+bangla+meaning+pdf` identified as a malicious redirector. The heuristic `PDF_SEO_LINK_FARM` indicates a large number of external PDF links, suggesting a campaign to manipulate search engine results or distribute further content. The ML classifier strongly supports the malicious nature of this PDF.

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=ayatul+kursi+bangla+meaning+pdf
    • http://files.bengonzalez.com/uploads/1/3/1/0/131070459/jozivinir.pdf
    • http://files.northernnerd.com/uploads/1/3/1/3/131379680/wobifopedufinu_beruwedorelixif_kugepa_gakofus.pdf
    • http://files.amesburyschoolcoalition.com/uploads/1/3/0/7/130739593/c02159ecdc.pdf
    • http://files.zacharyleophoto.com/uploads/1/3/0/8/130814423/597e6ce.pdf
    • http://files.thewondermart.shop/uploads/1/3/0/7/130739264/5ba55a98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3866/2053/files/72314712677.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/87519954184.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/pixudimimasinetobuxof.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/44475454300.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/legubukivegad.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/demubeseduxawaxupara.pdf
    • https://cdn.shopify.com/s/files/1/0431/6246/8516/files/zitobatuxamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1437/4047/files/bamub.pdf
    • https://cdn.shopify.com/s/files/1/0435/1072/6815/files/wuturetelu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6616/2341/files/35861465474.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2481/files/holy_quran_with_bangla_translation_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7492/9319/files/39296291445.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000aa36.bin
928683cc9b651b910e6d53e7f45111edcb4b52cf5d07a34fcb2b346d99aa0f1f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAA36 24384 bytes
font_00_sfnt_off00005d4e.bin
0dbbf101547eeab68859358b311312ef0f09cec8369ced0f775a679cb7d85355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4E 5656 bytes
font_01_sfnt_off00007076.bin
3a6a84b58a623cf6f18b6568653a25163af1decaa18e583617e30960f34a1b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7076 7404 bytes
font_02_sfnt_off00008819.bin
13ec6bdc9e1b9f3a943afce936c1b523229abdf3c1ad8ed739af7c48b9af33fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8819 9896 bytes

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