Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4af90d39bb74d6…

MALICIOUS

PDF

36.7 KB Created: 2020-08-14 00:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c01ebf8aad5fd44b405f84e1f3eaee7 SHA-1: 0c3db3bcb4cd9dce03215c81048a1c5d8457a7af SHA-256: 6b4af90d39bb74d613c7a43f094c49f2c53881d63937ba8bbb79874e90f09736
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, masquerading as a free PDF to Word converter. This is further supported by heuristics indicating a malicious redirector and a link farm, suggesting an attempt to drive traffic to malicious sites. No scripts were extracted, but the presence of embedded URLs and the ML classifier output strongly indicate malicious intent.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=conversor%20pdf%20para%20word%20free%20gratis
    • http://kixapojo.lyonsvet.com/uploads/1/3/1/3/131380213/5272690.pdf
    • http://files.pugsinthekitchen.com/uploads/1/3/0/8/130874474/2188905.pdf
    • http://files.gamestorereddeer.com/uploads/1/3/2/6/132681617/zilon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/71395013842.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/49113821444.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/lost_empires_of_faerun.pdf
    • https://cdn.shopify.com/s/files/1/0430/8995/2922/files/30567471301.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0439/8078/3774/files/quit_claim_deed_illinois.pdf
    • https://cdn.shopify.com/s/files/1/0434/5085/9670/files/modul_akuntansi_sektor_publik.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/85603842170.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/daxoz.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/25517253547.pdf
    • https://cdn.shopify.com/s/files/1/0447/3726/5813/files/linux_centos_commands_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/7400/1825/files/71163873238.pdf
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/orthographe_gratuit.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005184.bin
c0a711a1a628c5f11ad57739f732166c48b45999f19ed081600688cee6409f7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5184 5236 bytes
font_01_sfnt_off00006376.bin
68c0aca82ddc7f432ef5daeb4fdd207cef04c134db9a748227aa554f4871c964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 10068 bytes

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