Malicious PDF — malware analysis report

Static analysis result for SHA-256 242fb100e7c6390b…

MALICIOUS

PDF

61.0 KB Created: 2020-10-26 06:20:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16bfeed3016b43e7eaf8b580f45a1576 SHA-1: 73830d4685c2c21bc506571fa50ff60ed5d9118b SHA-256: 242fb100e7c6390b477350b094734c339c9bd4899e4cc86b3d6dfc9d8bb96584
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, 'https://ttraff.club/123?keyword=exercices+corrig%25C3%25A9s+trigonom%25C3%25A9trie+1%25C3%25A8re+s+pdf', is flagged as a malicious redirector. The document body, while appearing to be educational content, is likely a lure to disguise the malicious intent of redirecting users to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.club/123?keyword=exercices+corrig%25C3%25A9s+trigonom%25C3%25A9trie+1%25C3%25A8re+s+pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f932db71872a.pdf
    • https://cdn-cms.f-static.net/uploads/4387821/normal_5f924659eb7fe.pdf
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f8ac5774739b.pdf
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/meziletawepal_sonob_waroxar_modudedegiwa.pdf
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/4973474.pdf
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/zital.pdf
    • https://cdn-cms.f-static.net/uploads/4366042/normal_5f86f499dd372.pdf
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f9159a32e747.pdf
    • https://cdn-cms.f-static.net/uploads/4377902/normal_5f93cc4ec8eae.pdf
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f87b86ec4f82.pdf
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f9379bd3c539.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0496/2634/9719/files/crosssection_of_earth.pdf
    • https://cdn.shopify.com/s/files/1/0477/3445/6476/files/kenmore_elite_ultra_wash_dishwasher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/30703551096.pdf
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/30553633860.pdf
    • https://s3.amazonaws.com/guwutivupudutu/a_view_from_the_bridge_york_notes.pdf
    • https://s3.amazonaws.com/magapeguwabe/23899557204.pdf
    • https://s3.amazonaws.com/mejawiwomak/aadhar_card_download_without_mobile_number.pdf
    • https://uploads.strikinglycdn.com/files/516841fc-b45a-49dd-a4cc-6a3a50d27f7d/jagged_alliance_2_guide.pdf
    • https://uploads.strikinglycdn.com/files/fa3317af-d190-45c1-addf-e2e4d32e3755/puwipisufifuliba.pdf
    • https://uploads.strikinglycdn.com/files/9a249a4f-74f8-4634-8314-a8e4abeccfa2/fawimasidub.pdf
    • https://uploads.strikinglycdn.com/files/89a3a145-d396-4cd9-a806-5e42123bc780/50017997890.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007fdb.bin
affde7745c3922551aab8321ed919fdf3c9c48139358ac72f3948e93b5793508		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7FDB 14040 bytes
font_00_sfnt_off00006d7c.bin
60e971eff5d8003965ad44ad590a4b09ea24b66c512faab2d008873456636982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7C 5596 bytes
font_02_sfnt_off0000a739.bin
f874d711d7318979c1153447affb1b2ab13792d3b46550f39363b9501f99fb14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA739 11900 bytes
font_03_sfnt_off0000ce22.bin
b4d7b5f87a8978f1277a285276ee3d2548d8364787386596eceaf3166abf6284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 16100 bytes

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