Malicious PDF — malware analysis report

Static analysis result for SHA-256 d737c829f2308c3e…

MALICIOUS

PDF

52.4 KB Created: 2020-08-21 03:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4578dfc6559c136202e574b76a6baf6 SHA-1: a8d85e388fe806622024d552906f4e78a95fd0f5 SHA-256: d737c829f2308c3e18241dd88e74f9ebb890b484d520c89add3384b641108a2c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to IELTS preparation. The document body also contains this URL and numerous other links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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/pify?keyword=barron%2527+s+ielts+strategies+and+tips+free
    • http://files.packandpostalcenter.com/uploads/1/3/0/9/130968972/felikoniwipowosi.pdf
    • http://files.tang-xun.com/uploads/1/3/1/4/131437306/pogodewerofebub.pdf
    • http://tegagag.mikemono.com/uploads/1/3/1/3/131383982/tuzux.pdf
    • http://sidinaruf.joelsheridan.com/uploads/1/3/2/7/132740249/vikudopinar_rozuragimarota_beluwijidewij_vuzusidekuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8342/files/pt_axa_financial_indonesia_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/agenda_docente_2020_gratis_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1494/files/84053641736.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3873/files/fodiraf.pdf
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/36244688246.pdf
    • https://cdn.shopify.com/s/files/1/0437/2230/9781/files/rivelosanilexumiriwubeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/3169/1421/files/75516721664.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/47277931221.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8708/files/solucionario_estadistica_para_administracion_y_economia_anderson_10_edicion.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/instagram_analytics_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gidawibozifuniji.pdf
    • https://cdn.shopify.com/s/files/1/0436/0863/7602/files/best_psp_themes.pdf
    • https://cdn.shopify.com/s/files/1/0432/2109/0471/files/konofedivumasatapus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00009a57.bin
6fb7ed5ed46e07cf5fdce9d7096355e997dfadf40b627bdbed7fc0b1e83304cf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9A57 23308 bytes
font_00_sfnt_off0000648b.bin
5b1a0e97b352fb794480a985a92dfedc4cfcb7bddcdf961379010b1cfc4e18b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648B 5292 bytes
font_01_sfnt_off0000769e.bin
8813628c42fd76d3b71a828265b109ef24a0de4d5cbd45f7025cedbf7c76f09a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769E 10612 bytes

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