Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ff4e9662c02ccf…

MALICIOUS

PDF

44.6 KB Created: 2020-08-15 00:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02607137c70f9488fb0f4bc685e1435a SHA-1: 8ba2300232b5263f0b7547f5d5654ef396688c80 SHA-256: 66ff4e9662c02ccff5a1aba90192d261382492cc12de64261c1b0a0bd4b56e6a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The heuristic 'PDF_SEO_LINK_FARM' further suggests this document is part of a larger scheme to distribute malicious links, likely for phishing or malware distribution. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious URL is a strong indicator of malicious intent.

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/wb?keyword=pronoms%20personnels%20anglais%20pdf
    • http://files.amredco.com/uploads/1/3/0/8/130874612/4908829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/19547292604.pdf
    • https://cdn.shopify.com/s/files/1/0430/9506/4730/files/philosophy_of_the_arts_an_introduction_to_aesthetics.pdf
    • https://cdn.shopify.com/s/files/1/0437/3427/0117/files/federal_financial_aid_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/53498092764.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11783771814.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/best_vedic_astrology_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/kokixogutimijovikuni.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/handout_biologi_sma.pdf
    • https://cdn.shopify.com/s/files/1/0434/3712/9895/files/candle_in_the_wind_piano_solo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9599/7096/files/schuco_curtain_wall_details.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/modele_attestation_de_travail_maroc.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/99083489471.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/seismic_design_manual_2nd_edition_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e19.bin
6bcbc515b5ebe85f2cdb1947a5d81f95e677aa58010eaf3d3cbc2ac3d0e5fb7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E19 5072 bytes
font_01_sfnt_off00006f29.bin
885597e009769f316f9f1a52a088f0f30347988b971b0a64b965105ec4b9a509		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F29 12372 bytes
font_02_sfnt_off0000963a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x963A 4324 bytes

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