Malicious PDF — malware analysis report

Static analysis result for SHA-256 338c37a91ad4d303…

MALICIOUS

PDF

46.0 KB Created: 2020-08-27 14:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 385cb055c50c4aa8d00383d77032ed31 SHA-1: 558ace7a8470132433179307da6f3787e68ec553 SHA-256: 338c37a91ad4d3034dbfd9077ec15973dfe1c3a3b6370bbe41893d5b28348f62
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector service. The document body contains text that appears to be obfuscated or corrupted, but the presence of the URL 'https://ttraff.com/pify?keyword=the+return+nightfall+pdf' strongly suggests a phishing or redirection attempt. The ML classifier also provided a very high confidence score for maliciousness.

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=the+return+nightfall+pdf
    • http://files.adrianpollard.net/uploads/1/3/1/4/131483128/neniwifaja_nowowud_wudipi_jafeluzuxe.pdf
    • http://jigavo.oakbaychoir.com/uploads/1/3/1/4/131437601/7d5bac83111c376.pdf
    • http://nojesoga.safespacesupervision.co.uk/uploads/1/3/2/6/132695839/8017293.pdf
    • http://files.haroldkramer.com/uploads/1/3/0/7/130739043/c96823e103.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/tipupi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/55956440204.pdf
    • https://cdn.shopify.com/s/files/1/0433/1018/6654/files/aprendizaje_basado_en_problemas.pdf
    • https://cdn.shopify.com/s/files/1/0435/3880/8991/files/70568481493.pdf
    • https://cdn.shopify.com/s/files/1/0434/6262/3394/files/morijuwosokoxoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/upland_primary_school_bexleyheath_ofsted_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/fezaditedu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000079cd.bin
fdc25426b26bc14770ed31dab2de98cf1e08d94851d7c693940a02987151968c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79CD 5076 bytes
font_01_sfnt_off00008b09.bin
7ee31dfe075c4a2d6bf8df1dd687ea426d1b0b71ca880ba3b54b50af0fa522ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B09 9592 bytes

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