Malicious PDF — malware analysis report

Static analysis result for SHA-256 666e157a938af14e…

MALICIOUS

PDF

40.9 KB Created: 2020-08-08 06:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad45504ffeb782a1cf72c594da3904dd SHA-1: ef3d0aad095607e0c3d9252bf5e5d88806b04ab6 SHA-256: 666e157a938af14e62f38688e81d159353066f008895454537b2e9262827fabb
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a character reference letter for child custody. The ML classifier strongly indicated maliciousness, and the PDF is flagged for linking to known malicious infrastructure. While no scripts were extracted, the embedded URLs and the nature of the document content suggest a phishing or redirection attempt to a malicious site.

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.ru/pify?keyword=character+reference+letter+for+child+custody+pdf
    • http://files.movingmedicineali.com/uploads/1/3/0/7/130776611/tiluvowufit_nejiritid_tomevimitewivav_werixef.pdf
    • http://wibag.stannesbirmingham.com/uploads/1/3/0/7/130775219/fosufolovafig_fofufafemozaro.pdf
    • http://files.himalayanadventures.net/uploads/1/3/0/7/130738614/9877161.pdf
    • http://files.wauwatosabasketballclub.com/uploads/1/3/1/4/131453451/1059953.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7601/8585/files/c_random_number_in_range.pdf
    • https://cdn.shopify.com/s/files/1/0428/2109/1484/files/jasiwekebutese.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/cbse_grade_12_maths_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/97254897342.pdf
    • https://cdn.shopify.com/s/files/1/0432/2240/1185/files/kobuxemolubavofixep.pdf
    • https://cdn.shopify.com/s/files/1/0430/6465/6026/files/bobcat_operators_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/5364/4966/files/filsafat_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3296/files/mogutagakikofog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/26875145969.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/78503776173.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/91793473441.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/vefimigevujiri.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_off00006475.bin
020d8ad14bdf2c9c506407f081b3a6fd5e94bfc0e038ff5f896f124d73e047b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6475 5248 bytes
font_01_sfnt_off0000764e.bin
3eb7fbc7f5d0d158b319324228e79d15a4e7dadb29ffcb0891a613059bd6d0d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764E 9484 bytes

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