Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d778af2c79d2e11…

MALICIOUS

PDF

43.5 KB Created: 2020-08-24 03:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6226078548e3c02121f371f8ca4937c2 SHA-1: c5e66c65d1bd317d5337ba07c52e51cc1c5c0132 SHA-256: 8d778af2c79d2e1111ee0319b8dd2d907a8a0fe152d141356c72752ccb492f31
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure for 'free Udemy courses' and embeds multiple links. One critical heuristic indicates a malicious redirector link to 'ttraff.com', which is likely used to funnel victims to further malicious content. Another heuristic flags a PDF link farm, suggesting an attempt to distribute malicious content widely. The document body, though partially corrupted, contains the same lure and the malicious redirector URL.

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.
  • 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
  • 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/pify?keyword=free+udemy+courses++direct+link
    • http://files.gogovernors.com/uploads/1/3/1/4/131406762/6528224.pdf
    • http://sojemevek.saritaredalia.com/uploads/1/3/1/0/131070719/xegagevarireto-sejurar-ladoji-xonito.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0438/8782/0968/files/loxoxomepidosaxusogotif.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/59157733751.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9366/files/4255520395.pdf
    • https://cdn.shopify.com/s/files/1/0434/8710/1094/files/3793603357.pdf
    • https://cdn.shopify.com/s/files/1/0428/1879/7724/files/ejercicios_para_marcar_abdomen.pdf
    • https://cdn.shopify.com/s/files/1/0433/6123/9192/files/61964076063.pdf
    • https://cdn.shopify.com/s/files/1/0432/3947/3314/files/lozajorozuxesureforegivig.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005599.bin
7339c50fc8e08fb40984be36a33fb70fbdd5a86609735e00f27cad8b010ca3b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5599 4876 bytes
font_01_sfnt_off00006611.bin
3d5089feb4d152925e8986f91a82252eeb0e1be49f3ac2cf6a200cef1c2d342e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 2080 bytes
font_02_sfnt_off00006fab.bin
bdad56dfab49e33638ae3ba773bb0bdd66a83c7d14cffe055fd6fdcbab9f0fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FAB 10268 bytes
font_03_sfnt_off000092b9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92B9 4324 bytes

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