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) First seen: 2020-09-04
MD5: d198e551cd8701c669a2bc9cd2ceb2ca SHA-1: 7039d8364552469fa93b3f1e4b73db19c57c6b36 SHA-256: 716d699e5aeb2f9326732aef2c01903cb1a72dee47a72f62b3c0c58ff3d6cc2c
194 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links designed to create an SEO link farm, likely for malicious purposes. The primary link, 'https://ttraff.com/wb?keyword=doppler%20venoso%20de%20miembros%20inferiores%20pdf', redirects to further malicious infrastructure. The ML classifier strongly indicated maliciousness, and the presence of a link farm points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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 In PDF document text
    • http://files.planninginblackandwhite.com/uploads/1/3/2/7/132710655/bobuzugipiz_renele_litazafurusagop.pdfIn PDF document text
    • http://files.bookhivebeerclub.com/uploads/1/3/0/9/130969910/f65beae6b726.pdfIn PDF document text
    • http://files.apcorx.org/uploads/1/3/0/7/130739740/rudegetetew.pdfIn PDF document text
    • http://files.vomhiddencreek.com/uploads/1/3/1/6/131606127/kukuko.pdfIn PDF document text
    • http://files.dorabramden.com/uploads/1/3/1/3/131382141/3729828.pdfIn PDF document text
    • http://files.akmittal.com/uploads/1/3/0/7/130739549/5829121.pdfIn PDF document text
    • http://files.vcgallery.org/uploads/1/3/1/8/131856381/rokererukirejakifu.pdfIn PDF document text
    • http://files.metaradiant.org/uploads/1/3/0/7/130775688/luseworexe_nimazumon_pinum_vudowagoja.pdfIn PDF document text
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sebogoveb.files.wordpress.com/2020/06/finoditedu.pdfIn PDF document text
    • https://vefaxut.files.wordpress.com/2020/07/luwidusogurosus.pdfIn PDF document text
    • https://xadixijep.files.wordpress.com/2020/06/83442757549.pdfIn PDF document text
    • https://ruziridolisa.files.wordpress.com/2020/06/77501995597.pdfIn PDF document text
    • https://fuwetatew.files.wordpress.com/2020/06/liripitojugizeb.pdfIn PDF document text
    • https://jamamovasuk.files.wordpress.com/2020/06/36055747631.pdfIn PDF document text
    • https://legebepome.files.wordpress.com/2020/06/69460449340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/68876684382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fesitoxerevujadutag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73875000904.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41718344304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8841 1696 bytes
SHA-256: 9a98723dae936e7c7c8d502cfbcf27bf9f93cff28ba6a06675a6a95244fbc4de
font_01_sfnt_off0000906b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x906B 4884 bytes
SHA-256: f702cb8c45b92df37b907d7a7f6c4ec31706b7642674a0053bc0c76e783a1b53
font_02_sfnt_off0000a0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0DD 14804 bytes
SHA-256: 018ca3fa97e16f167ba8ccdd0a0308d41927dfd4637ebb230a34f519611d03dc