Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c13ad868a9b5925…

MALICIOUS

PDF

43.0 KB Created: 2020-08-20 21:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3723893eecfd4fab1796c7fdcd56ea8 SHA-1: e174c5a384907916848b543feb9e34b43ec354f7 SHA-256: 7c13ad868a9b5925b729732212934a126ba22f45e4964629f1141bf4c471cfd5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, and a large number of other links, suggesting a link farm designed to obscure the final destination. The document body text, though garbled, contains the phrase 'Secure folder android alternative' and a URL that matches the malicious redirector, indicating a lure. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=secure+folder+android+alternative
    • http://nojesoga.safespacesupervision.co.uk/uploads/1/3/2/6/132695839/8017293.pdf
    • http://zizejaxod.furryfriendsofscotland.com/uploads/1/3/0/7/130738909/2ec2e258ab6af0.pdf
    • http://zekafejof.caregiverinspirations.com/uploads/1/3/0/9/130969279/risod.pdf
    • http://files.bluesology.net/uploads/1/3/2/6/132682806/mewug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8144/9126/files/giledadedep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6466/files/lorigafagibomisi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4715/6903/files/adjectives_superlative_and_comparative_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/expressing_your_feelings_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/2504/7463/files/dnd_5e_artificer_revised_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/blood_relationship_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/46947934717.pdf
    • https://cdn.shopify.com/s/files/1/0430/6406/6201/files/xv2_mod_installer.pdf
    • https://cdn.shopify.com/s/files/1/0434/4843/4840/files/hp_envy_4500_printer_driver.pdf
    • https://cdn.shopify.com/s/files/1/0444/2708/3943/files/ben_hur_movie_tamil_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/35220135329.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/sistema_circulatorio_fisiologia.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_off00006bde.bin
a8b7a79c7361b7cbf1e79848f8ce44e7020f23c263fd98a32502121936659984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BDE 5000 bytes
font_01_sfnt_off00007cee.bin
fdc30b86d8b197660ec5a01159ca91c3829c2fe1f2249a6ae02304b4cdda1a0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEE 9848 bytes

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