Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b67b574e13fdec5…

MALICIOUS

PDF

49.4 KB Created: 2020-07-09 09:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db69f28fffb64423157cb772986f74ca SHA-1: edc58922a53cd611d8ba84072262b30490903361 SHA-256: 8b67b574e13fdec5da10b427afa61816ef38e225f77407a54c660700654eff8e
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to the embedded malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. 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/wb?keyword=doa%20upacara%20hardiknas%202018%20pdf
    • http://files.adelaidechickensittingservice.com/uploads/1/3/1/8/131857071/wovakemeluwo-bokevanukapaku.pdf
    • http://files.adventureoutpostsurvivalbags.com/uploads/1/3/0/9/130969548/zowomem_xatetafovafo.pdf
    • http://files.jasondrums.com/uploads/1/3/0/8/130813885/6076475.pdf
    • http://files.pasolibre13.com/uploads/1/3/1/8/131858287/wexuvamo.pdf
    • http://files.lewisuniversityhockey.com/uploads/1/3/0/8/130874647/350cfb2fa2.pdf
    • http://files.steppingstonesplaycenter.com/uploads/1/3/1/4/131482828/636d508f159bbce.pdf
    • http://files.rutchas.com/uploads/1/3/1/6/131636980/famesakusulo.pdf
    • http://files.intowishinarts.com/uploads/1/3/2/6/132683173/3b961480d37aba2.pdf
    • http://files.portageresourceguide.com/uploads/1/3/1/6/131606644/8719065.pdf
    • http://files.portageresourcegu
    • https://kataxufekor.files.wordpress.com/2020/06/tugidivonigev.pdf
    • https://rukanaruji.files.wordpress.com/2020/07/puwer.pdf
    • https://witujaji.files.wordpress.com/2020/06/gadurufudobujumanifanofuv.pdf
    • https://fejikix.files.wordpress.com/2020/06/wakubajejavafawogobevunu.pdf
    • https://totapis700874780.files.wordpress.com/2020/07/movuxefiked.pdf
    • https://zuzelerebola.files.wordpress.com/2020/06/1613398569.pdf
    • https://diwegola.files.wordpress.com/2020/06/20728565776.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pafinekumukomotutawewokab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008341.bin
89c13186481657f5ff47160c2344c54d239bd3e4e077f575b8e2a86be98e903d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8341 5480 bytes
font_01_sfnt_off000095cc.bin
0e22f2a06f8da923072499b0fe7cd52625b9d91a592f1ab2437ed34f303a30dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95CC 10104 bytes

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