Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2fed50c13253066…

MALICIOUS

PDF

47.0 KB Created: 2020-08-04 08:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40a194d87a1c56cbbcbfcadf9b1f17f SHA-1: e677a8c37f6dd1d87a5ccc49d26987330530f372 SHA-256: b2fed50c132530664e97550cf529acab3ef4142575dcd345322bd203480f392d
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though obfuscated, contains text related to 'chainama college application form download pdf', suggesting a lure to trick users into clicking the malicious redirector. 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=chainama+college+application+form+download+pdf
    • http://files.majurelab.org/uploads/1/3/1/8/131871829/nojix-kudopajon-nuzamuzokan.pdf
    • http://files.livinmybliss.com/uploads/1/3/0/7/130739404/juvoxuxejovejujos.pdf
    • http://files.nancypanko.com/uploads/1/3/0/7/130776735/0942f7f48cf56e.pdf
    • http://files.susansgardenminipigs.com/uploads/1/3/0/7/130740551/mevuziwedez_kuvebonoj_mibexi_witokapixusazux.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6917/files/social_security_form_w-_4v.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/gepetifikoviwisiwekum.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/80250711109.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7182/files/sokonigexip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasidobedibugamis.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/bijutawigavabugus.pdf
    • https://cdn.shopify.com/s/files/1/0439/4899/8811/files/bloodborne_undead_giant.pdf
    • https://cdn.shopify.com/s/files/1/0439/8029/2254/files/gua_completa_de_calistenia_y_street_workout_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/24477076733.pdf
    • https://cdn.shopify.com/s/files/1/0435/0600/8216/files/66059317780.pdf
    • https://cdn.shopify.com/s/files/1/0439/8202/8958/files/tumizenazebizesisatinego.pdf
    • https://cdn.shopify.com/s/files/1/0432/0801/6027/files/retujopitiwuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/2014/0191/files/70648494425.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_off00006f3d.bin
b70688e013720edb64566fe4b5c783fcd7947a5d0319c599755af984f5ec3a6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F3D 5388 bytes
font_01_sfnt_off00008173.bin
cf12c4c8124a01892f2b91a162af19751b68722b674958706d7610a9bdc8f068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8173 14512 bytes

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