Malicious PDF — malware analysis report

Static analysis result for SHA-256 1443393204694a22…

MALICIOUS

PDF

66.4 KB Created: 2020-10-27 18:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44abc1ade76b46b9e07ce5a64de2cbc9 SHA-1: 90c58501033f950577e05c6a1ea273111b322b56 SHA-256: 1443393204694a22a7217f3668864e14c2147bb9827281fd2a32fcb713dcb499
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'Ruskin bond interview questions and answers pdf'. This suggests an attempt to trick users into clicking the malicious link, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://cctraff.ru/wb?keyword=ruskin%20bond%20interview%20questions%20and%20answers%20pdf
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5f91cc6ce9e47.pdf
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f90b54354eed.pdf
    • https://cdn-cms.f-static.net/uploads/4366401/normal_5f87ae9634c77.pdf
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f89956b52cc9.pdf
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5f909b2ca9b3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wonoti/fsa_eligible_expenses_2018_irs.pdf
    • https://s3.amazonaws.com/wizidimawag/2009_buick_enclave_manual.pdf
    • https://s3.amazonaws.com/tumasun/xunevevovetav.pdf
    • https://s3.amazonaws.com/ritoma/vukoki.pdf
    • https://s3.amazonaws.com/fojaxexino/lanufafegemaxuj.pdf
    • https://s3.amazonaws.com/xafaxotaful/control_system_engineering_book_free_download.pdf
    • https://s3.amazonaws.com/wilugugo/90029256775.pdf
    • https://s3.amazonaws.com/leguvefu/71253586516.pdf
    • https://s3.amazonaws.com/leguvefu/agricultural_engineering_board_exam_reviewer_with_answer_key.pdf
    • https://s3.amazonaws.com/bitizopovopaso/10873480182.pdf
    • https://s3.amazonaws.com/pujinit/como_hacer_una_bibliografia_estilo_apa_de_un.pdf
    • https://s3.amazonaws.com/fokapikow/29257153013.pdf
    • https://cdn.shopify.com/s/files/1/0502/9458/7588/files/zilabeluzidolamefurus.pdf
    • https://cdn.shopify.com/s/files/1/0495/8388/2392/files/10246399805.pdf
    • https://cdn.shopify.com/s/files/1/0434/4699/3052/files/manualidades_navideas_con_foami_para_nios.pdf
    • https://cdn.shopify.com/s/files/1/0500/2969/1066/files/35839140486.pdf
    • https://cdn.shopify.com/s/files/1/0495/0025/8462/files/autosaver88_catalytic_converter.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/spirometry_normal_values.pdf
    • https://cdn.shopify.com/s/files/1/0501/5751/9005/files/radozofewekexenone.pdf
    • https://cdn.shopify.com/s/files/1/0477/3730/7292/files/ranidofigozemefir.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_off0000c116.bin
d414922e19fdfc363bee5f65709fb0e9d9cbf9c1a977c982248c16da71ade2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC116 5492 bytes
font_01_sfnt_off0000d3da.bin
f34853f48909deee1714b4769eaae3878e20898844dbb8534b393e3364d33f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 11864 bytes

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