Malicious PDF — malware analysis report

Static analysis result for SHA-256 8779eea50010fdb3…

MALICIOUS

PDF

45.2 KB Created: 2020-08-21 19:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3756d589aee1b711fa5aa0064ffdadc6 SHA-1: 730fe03916889b563fb171634c20028c6b61fd49 SHA-256: 8779eea50010fdb3f675bbe659faaf6e3cdd62e13aa1ce806ac9c8d94f6d959c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=microsoft+excel+2013+exam+questions+and+answers', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The presence of numerous other links, many pointing to Shopify domains, indicates a link farm strategy to improve search engine ranking for the malicious lure.

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.com/pify?keyword=microsoft+excel+2013+exam+questions+and+answers
    • http://files.makatiprimeproperties.com/uploads/1/3/0/7/130775361/kufege.pdf
    • http://files.motionxdance.org/uploads/1/3/0/7/130775103/foxerodepev-newagok-wewajutavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2002/4989/files/babasaheb_ambedkar_in_marathi_information.pdf
    • https://cdn.shopify.com/s/files/1/0432/9141/0596/files/alfabeto_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fimovubonivunab.pdf
    • https://cdn.shopify.com/s/files/1/0432/5706/9736/files/focus_t25_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/94142085244.pdf
    • https://cdn.shopify.com/s/files/1/0450/2398/5828/files/pewuxuvuvifeje.pdf
    • https://cdn.shopify.com/s/files/1/0435/3510/6207/files/fowen.pdf
    • https://cdn.shopify.com/s/files/1/0464/1387/3320/files/6477535874.pdf
    • https://cdn.shopify.com/s/files/1/0439/0282/8699/files/pdf_viewer_for_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45235944591.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/aircraft_design_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2973/2248/files/biometria_ocular.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063fc.bin
f4983451f7fc43002823c0eeaa343ee0eb26e6567f131153c7dc5888d2d1943b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63FC 5832 bytes
font_01_sfnt_off000077c7.bin
5b8ece67e1391778b9ff6ca974f4e62dfcc247335d1a1f6edbf845c6c78fa6b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C7 9972 bytes
font_02_sfnt_off000099b1.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99B1 4324 bytes

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