Malicious PDF — malware analysis report

Static analysis result for SHA-256 861a3b11da4d4877…

MALICIOUS

PDF

47.5 KB Created: 2020-08-17 01:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7de9bfb1443e5cb5039c0af97c548112 SHA-1: 5cf056bce8450bed51a04e6543068825196b937c SHA-256: 861a3b11da4d48776ad7964a1a3821a90f49184639588dec2931578488d5628b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of links, many pointing to a redirector service, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content attempts to trick the user into installing a browser extension or update, a common tactic for malware delivery. The presence of embedded URLs, including a known malicious redirector, supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=one+ui+launcher+for+android+7
    • http://pijowaf.blowingoakfarm.com/uploads/1/3/1/8/131858540/bexosisum_jexiwerig_tigonigugamurar.pdf
    • http://xutev.windwardcbl.org/uploads/1/3/0/7/130776791/1456614.pdf
    • http://files.dkg-gammachi.org/uploads/1/3/1/4/131438245/mirejunofiju-lilov-rovawovenu-kavinid.pdf
    • http://kaxalep.strozzimeowvellous.com/uploads/1/3/1/6/131606490/liliganok.pdf
    • http://files.cocoaandspice.com/uploads/1/3/1/4/131483019/9971581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/mibazabazaxuzobalanoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/wabegujo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6516/files/21430462638.pdf
    • https://cdn.shopify.com/s/files/1/0437/7300/1889/files/candy_crush_saga_2019_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/wazafirubonatosit.pdf
    • https://cdn.shopify.com/s/files/1/0439/7131/3822/files/renivorujogipijokareluvas.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/79066115362.pdf
    • https://cdn.shopify.com/s/files/1/0440/8839/3893/files/toworuvedizujepujej.pdf
    • https://cdn.shopify.com/s/files/1/0438/9833/9496/files/78694813561.pdf
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/sonic_sunglasses_doctor_who.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_off000078f3.bin
5d1f0ce0fdc974c1e0ab991f229ccbc2fc22c7c797327b7dbd857aa1fc9968e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78F3 5040 bytes
font_01_sfnt_off00008a13.bin
9f44c60fa48b843621bcb9b0dd064a7eb55e78921b3ecb130a7c630765278796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A13 12280 bytes

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