Malicious PDF — malware analysis report

Static analysis result for SHA-256 72af13d5c3911264…

MALICIOUS

PDF

52.8 KB Created: 2020-08-14 06:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca95b17eeedc6478f1a4eb57c9b3ed5 SHA-1: 8bad6b8e151f8c0dd270047f41eb03713a8a4625 SHA-256: 72af13d5c3911264faaf88f80efd8884582b4c6c96b4c1689ebbc27b48252b45
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded document body text, though partially corrupted, includes the URL https://ttraff.cc/wb?keyword=fluency%20in%20english%20a%20course%20book%20for%20engineering%20students%20pdf, which is flagged as malicious. This indicates an attempt to lure users to a potentially harmful site under the guise of providing a PDF document.

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.cc/wb?keyword=fluency%20in%20english%20a%20course%20book%20for%20engineering%20students%20pdf
    • http://files.blastskates.com/uploads/1/3/0/7/130776599/vugetadesuxok.pdf
    • http://dopizobug.lhchristianchurch.com/uploads/1/3/1/6/131636612/db782f7b4.pdf
    • http://pupatunoj.goldstarenrichment.com/uploads/1/3/2/6/132695675/5246699.pdf
    • http://files.haverhillauthenticsicilian.com/uploads/1/3/1/3/131380771/denuxideru_nifixa_bafepadamofuw_fiduze.pdf
    • http://zitot.marlonkellyloans.com/uploads/1/3/1/6/131637136/c53605e2f75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0432/4294/6724/files/pejimubekamam.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6822/files/azure_information_protection_plan_1_office_365.pdf
    • https://cdn.shopify.com/s/files/1/0429/6710/5687/files/nirvana_bleach_tab_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/2383/4024/files/befokupovoxapivoroviri.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4533/files/tenidopukapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7781/files/acropora_humilis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/ode_to_my_car.pdf
    • https://cdn.shopify.com/s/files/1/0438/8500/2920/files/64781493134.pdf
    • https://cdn.shopify.com/s/files/1/0439/2864/9896/files/12391283767.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/72956377050.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
font_00_sfnt_off00006078.bin
73b4782666ed31113889ce52cbf147839285d7e9f1cb73224fbb019751b39674		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6078 5676 bytes
font_01_sfnt_off000073c5.bin
7d3e8111cbc62a2ca9c1de4d2ea9bf303ac3f9a65b0cd07c64e0679d7204bb92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 3512 bytes
font_02_sfnt_off0000820c.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820C 2320 bytes
font_03_sfnt_off00008c5c.bin
105fa3b16c446a121933a93b3a7b580346d33fa7f4eb9bf65ec8e1fc7d5a722d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5C 10052 bytes
font_04_sfnt_off0000aed4.bin
648c74944f7c2e40e00533251366dbb9a2954feff74ac2196c0dc5315684b723		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAED4 16224 bytes

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