Malicious PDF — malware analysis report

Static analysis result for SHA-256 83be4014a5f13f44…

MALICIOUS

PDF

45.9 KB Created: 2020-10-20 09:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9304d735808986dbc711b169bf6eb245 SHA-1: 3abbf937afeefcb610de65eda869047654da7318 SHA-256: 83be4014a5f13f448364cf86f466d13d8c3efd3a1d1a266ab4496883cd79a056
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 PDF files hosted on various platforms, suggesting an attempt to manipulate search engine results or distribute content. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to redirect users to harmful sites. The document body contains a URL that aligns with the heuristic findings.

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.me/123?keyword=janva+jevu+book+pdf+download
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/vedunu.pdf
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/povakokuxefos.pdf
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/32487625c0.pdf
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/3503879.pdf
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f89f59d76370.pdf
    • https://cdn-cms.f-static.net/uploads/4368781/normal_5f888419d93c9.pdf
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8da57f39bf4.pdf
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f8e3d79e2b62.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f89a7394972a.pdf
    • https://cdn-cms.f-static.net/uploads/4390999/normal_5f8dff93aed38.pdf
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f8bdd82e28c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0478/0038/5695/files/1997_nissan_pathfinder_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0500/1229/1264/files/fulibusaduxebabeji.pdf
    • https://cdn.shopify.com/s/files/1/0496/8081/0136/files/830_credit_score_mortgage.pdf
    • https://cdn.shopify.com/s/files/1/0497/8494/6850/files/klepsydra_pogrzebowa_wzr.pdf
    • https://uploads.strikinglycdn.com/files/8e9f981c-6f3d-485b-9f7b-af916948060e/8694313342.pdf
    • https://uploads.strikinglycdn.com/files/bcf553a4-b477-4f10-a288-34240754f534/kimevupigazefomujujigaraw.pdf
    • https://uploads.strikinglycdn.com/files/af0aa9a5-d9c0-4a75-8ef0-a20b281e66af/33384600554.pdf
    • https://uploads.strikinglycdn.com/files/dfa02991-d8e4-4056-a0cc-cbd814cf1df6/61466008531.pdf
    • https://uploads.strikinglycdn.com/files/7a5e81b8-b311-4f5b-a9ae-3a72fa8f8908/bibeboguvulevifariligovi.pdf
    • https://uploads.strikinglycdn.com/files/4c67282d-9f6a-45ed-b6e2-60bba31382cf/konusakala.pdf
    • https://uploads.strikinglycdn.com/files/b60204bd-7b91-4e6c-b5e7-03169fc5824c/mebeja.pdf
    • https://uploads.strikinglycdn.com/files/4ee1bb84-468b-471a-b129-f81ce2940f13/83514526984.pdf
    • https://uploads.strikinglycdn.com/files/3f467c23-b3d3-4c2c-acdc-20eb9bcb93aa/xebugijidus.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_off00007475.bin
c397776c6250c0024f764132c492d15d7c219f38c24ea85e3c907554d9dd1cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7475 5184 bytes
font_01_sfnt_off00008645.bin
44ca9bc01bf74d5c1e022abb764c9c92ac61f4d77fd21799e8405d6bf1c91b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8645 10360 bytes

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