Malicious PDF — malware analysis report

Static analysis result for SHA-256 143cd0dc8055174e…

MALICIOUS

PDF

44.8 KB Created: 2020-08-28 12:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c6bc47373d20d293d95bc2ddc63bc56 SHA-1: 7cc000ecda49526e65707cab4aee349feb18902a SHA-256: 143cd0dc8055174eadcaf4dedf2cae468b987755e7bf02fd871856847a6d06bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of embedded links, many of which point to redirector infrastructure. The document body text, while garbled, contains a URL that appears to be a lure for a textbook download, likely to disguise the malicious intent. The primary malicious URL identified is a redirector designed to send users to further malicious content.

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=calculus+early+transcendentals+11th+edition+anton+pdf
    • http://files.mcleanwrestling.com/uploads/1/3/2/6/132681658/5aa4bccd.pdf
    • http://julasura.youroasis4health.com/uploads/1/3/2/7/132712324/zogosopuxu.pdf
    • http://xalat.kateholland.com.au/uploads/1/3/1/6/131606339/c45c53d47f.pdf
    • http://ridudimaz.marleysinternational.com/uploads/1/3/2/7/132740720/8335918.pdf
    • http://netodal.highspringschurchofchrist.org/uploads/1/3/1/0/131070374/buforo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1265/1170/files/lesumewobo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/lazeparajemuroligovexi.pdf
    • https://cdn.shopify.com/s/files/1/0465/0070/8510/files/cual_es_la_estructura_cristalina_de_los_materiales_semiconductores.pdf
    • https://cdn.shopify.com/s/files/1/0437/5393/0901/files/18188159652.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/mepidupekewevinawitini.pdf
    • https://cdn.shopify.com/s/files/1/0431/3274/7927/files/bigabanepuvejuvifesuligen.pdf
    • https://cdn.shopify.com/s/files/1/0460/2216/4639/files/my_calculator_secret_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/love_hurts_lyrics_incubus.pdf
    • https://cdn.shopify.com/s/files/1/0437/5724/0478/files/netbeans_jasper_reports_library.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/55902632508.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/keylabs_sap_basis_material.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/minecraft_tnt_modu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/21546637955.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_off00006f39.bin
8437374d930a638c9a7d0154e94b4cc9911679238210b6eaffa5d855d88fcf5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F39 5304 bytes
font_01_sfnt_off00008141.bin
ef3e90825956fd53eea5cbc006c11e21e7ea3fc8a0e801d5135eca81f9986232		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8141 10592 bytes

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