Malicious PDF — malware analysis report

Static analysis result for SHA-256 68abbf02e89837cb…

MALICIOUS

PDF

63.9 KB Created: 2020-08-11 17:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e5d3aea44eea0ae1f0a748a15090a0c SHA-1: c598ece64fd3ae4682cf537aa800a0907eb56444 SHA-256: 68abbf02e89837cbe6f78e52eb5fc45e7a3ff9c925a4294be203006b8b267aca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=english+stories+for+reading+practice+pdf`. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=english+stories+for+reading+practice+pdf
    • http://files.yatesmillpta.org/uploads/1/3/0/9/130969061/xofimefora_zikomonigute.pdf
    • http://files.warkprimaryschool.co.uk/uploads/1/3/1/6/131607467/3975095.pdf
    • http://pudoni.anniegoesjack.com/uploads/1/3/0/8/130874457/2f4f68340c63f69.pdf
    • http://tolos.artimage.co.uk/uploads/1/3/1/6/131606490/jevasasuv-dobutifap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0428/6123/2294/files/orthographic_projection_problems_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0439/3749/7243/files/94972345445.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niborenegukudokeregus.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/73119555962.pdf
    • https://cdn.shopify.com/s/files/1/0431/2819/3186/files/62774405142.pdf
    • https://cdn.shopify.com/s/files/1/0434/9027/9574/files/zolotepuza.pdf
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/zuzub.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/bihar_stet_computer_science_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/tinegonamimunuzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7188/9817/files/widipizupewedodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3069/1491/files/34944389730.pdf
    • https://cdn.shopify.com/s/files/1/0438/4745/0789/files/10165065475.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6903/files/classroom_management_leadership_and_action_research_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/6481/9874/files/22743457609.pdf
    • https://cdn.shopify.com/s/files/1/0431/5290/0260/files/2010_honda_crv_service_manual.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a736.bin
8f2348bdc388257f8a75f364669ca98703a29a564115568d87c0c5ee0288f4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA736 5376 bytes
font_01_sfnt_off0000b969.bin
2f4f57679aa471443d00115b35f4bab3da0de6633540044bf2eacbf7d6d04750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB969 7248 bytes
font_02_sfnt_off0000cd38.bin
f422cc0fcc3e99199e24862fb55d53d109ac79d73f7b59e4bbf462dbf2a5d1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 10192 bytes

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