Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cafd3701af9e9e…

MALICIOUS

PDF

42.4 KB Created: 2020-08-20 19:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fad10c90741944db31b0131fa14960a3 SHA-1: 36ffd79b5d08b9d812463d196c162a61387d740e SHA-256: 78cafd3701af9e9e481612f41c6a7d630afa034e6d1065496ecd3834f6b7c8be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document also features a large number of external links, many hosted on Shopify, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=formarrayname+angular+4+example
    • http://files.stfrancis-sthedwig.com/uploads/1/3/2/6/132682113/2405117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5611/0495/files/android_studio_run_app_on_usb_device.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/duloravomamet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/1960_chevy_bel_air.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/45372316815.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1191/files/brevet_franais_2020_corrig.pdf
    • https://cdn.shopify.com/s/files/1/0438/3227/9200/files/84521085505.pdf
    • https://cdn.shopify.com/s/files/1/0432/8597/1110/files/diwegowu.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_off00005762.bin
3b6143d7764c9ca00c81ae6fe4d46558c201c49bc92183676f52775e4c2d3b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5762 5172 bytes
font_01_sfnt_off000068fe.bin
5325e41aa2391c652bca102f23628cf934ba08bc153d82465ca0e9491004950c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FE 19540 bytes

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