Malicious PDF — malware analysis report

Static analysis result for SHA-256 716d699e5aeb2f93…

MALICIOUS

PDF

55.2 KB Created: 2020-07-10 06:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d198e551cd8701c669a2bc9cd2ceb2ca SHA-1: 7039d8364552469fa93b3f1e4b73db19c57c6b36 SHA-256: 716d699e5aeb2f9326732aef2c01903cb1a72dee47a72f62b3c0c58ff3d6cc2c
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One prominent link redirects to `https://ttraff.com/wb?keyword=doppler%20venoso%20de%20miembros%20inferiores%20pdf`, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of outbound links indicates a high likelihood of malicious redirection.

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/wb?keyword=doppler%20venoso%20de%20miembros%20inferiores%20pdf
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdf
    • http://files.bookhivebeerclub.com/uploads/1/3/0/9/130969910/f65beae6b726.pdf
    • http://files.apcorx.org/uploads/1/3/0/7/130739740/rudegetetew.pdf
    • http://files.vomhiddencreek.com/uploads/1/3/1/6/131606127/kukuko.pdf
    • http://files.dorabramden.com/uploads/1/3/1/3/131382141/3729828.pdf
    • http://files.akmittal.com/uploads/1/3/0/7/130739549/5829121.pdf
    • http://files.vcgallery.org/uploads/1/3/1/8/131856381/rokererukirejakifu.pdf
    • http://files.metaradiant.org/uploads/1/3/0/7/130775688/luseworexe_nimazumon_pinum_vudowagoja.pdf
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://sebogoveb.files.wordpress.com/2020/06/finoditedu.pdf
    • https://vefaxut.files.wordpress.com/2020/07/luwidusogurosus.pdf
    • https://xadixijep.files.wordpress.com/2020/06/83442757549.pdf
    • https://ruziridolisa.files.wordpress.com/2020/06/77501995597.pdf
    • https://fuwetatew.files.wordpress.com/2020/06/liripitojugizeb.pdf
    • https://jamamovasuk.files.wordpress.com/2020/06/36055747631.pdf
    • https://legebepome.files.wordpress.com/2020/06/69460449340.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesitoxerevujadutag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73875000904.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008841.bin
9a98723dae936e7c7c8d502cfbcf27bf9f93cff28ba6a06675a6a95244fbc4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8841 1696 bytes
font_01_sfnt_off0000906b.bin
f702cb8c45b92df37b907d7a7f6c4ec31706b7642674a0053bc0c76e783a1b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906B 4884 bytes
font_02_sfnt_off0000a0dd.bin
018ca3fa97e16f167ba8ccdd0a0308d41927dfd4637ebb230a34f519611d03dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DD 14804 bytes

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