Malicious PDF — malware analysis report

Static analysis result for SHA-256 846f6ee428d37c3f…

MALICIOUS

PDF

49.4 KB Created: 2020-08-15 04:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24dae1c6dcd6c0ddfb27159494d1ca5b SHA-1: 9cc913bdc7f67861060e10ade45dfb4a4a68f54d SHA-256: 846f6ee428d37c3f45049ec528f0f931fc6bf0ed6348938ce05a97031c31f12f
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.cc, indicating a phishing or redirection attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the text 'Useful phrasal verbs for ielts pdf' and the malicious URL, suggesting a lure to a malicious site disguised as a PDF download. No scripts were extracted from this sample.

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.cc/wb?keyword=useful%20phrasal%20verbs%20for%20ielts%20pdf
    • http://petufi.griffinace.com/uploads/1/3/0/7/130739590/xederotanoduluzu.pdf
    • http://sener.gregadamsart.com/uploads/1/3/2/7/132712358/5163429.pdf
    • http://siton.sathercreative.com/uploads/1/3/1/8/131871699/puledojif_xezawotuporeda_fiwidix_situnuwofu.pdf
    • http://files.elfangelscreationslloyd.ca/uploads/1/3/1/4/131438069/xireduxakuvuda_sisuvurawujo_vobajexazugeme_jimifazizow.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/sebuvamavel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4419/9829/files/musixusejunujefilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1580/files/25562982502.pdf
    • https://cdn.shopify.com/s/files/1/0454/2329/6680/files/message_app_for_samsung.pdf
    • https://cdn.shopify.com/s/files/1/0433/5055/6821/files/35352844461.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/45557585492.pdf
    • https://cdn.shopify.com/s/files/1/0435/0715/5110/files/85143073350.pdf
    • https://cdn.shopify.com/s/files/1/0430/0354/3715/files/kopuna.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/joferuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/pujuvetiwojudu.pdf
    • https://cdn.shopify.com/s/files/1/0451/1121/4245/files/analysing_an_advertisement_worksheet.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_off00006070.bin
5315a99fb460b99f6ddfe2edc234268d6d1659518a5b19ac6d7f88dd0cd7d4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6070 5096 bytes
font_01_sfnt_off000071d6.bin
d9c636da33f5f0db02be4a40ea45d63f4c17d70963797c31cd35953da2f4484a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71D6 10508 bytes
font_02_sfnt_off00009530.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9530 16092 bytes
font_03_sfnt_off0000a9f7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9F7 4324 bytes

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