Malicious PDF — malware analysis report

Static analysis result for SHA-256 b387c9e9f534aab5…

MALICIOUS

PDF

41.9 KB Created: 2020-08-24 22:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee613f327cf2c913a090fb962178dc60 SHA-1: 4129fd26f798aa2caa277d4e4b6118db27ead963 SHA-256: b387c9e9f534aab52598e26febd6ae968519ab51d1fcee6137ddc481bfd06f2d
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with the primary link directing to a known malicious redirector. The document body, though partially obfuscated, contains text related to disabling Android app updates, suggesting a social engineering lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector URL indicates an attempt to lead the user to a malicious site.

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.cc/pify?keyword=disabilitare+aggiornamenti+automatici+app+android
    • http://rexeji.purduebap.org/uploads/1/3/2/8/132816066/93da0485.pdf
    • http://files.kmid.com.au/uploads/1/3/1/8/131858592/bolejazaner_moxipebesati_fikejubibisaje_pexufigefujo.pdf
    • http://files.lindyhop.gr/uploads/1/3/1/3/131383318/vujifalawa.pdf
    • http://valutu.keriduncan.com/uploads/1/3/2/6/132696323/nikuvapa-rikovela.pdf
    • http://nunopex.traversebaygroup.com/uploads/1/3/2/6/132696398/c3dff838ce53.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/23760531869.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/anabolisme_protein.pdf
    • https://cdn.shopify.com/s/files/1/0432/5949/4560/files/40693588070.pdf
    • https://cdn.shopify.com/s/files/1/0439/8252/0478/files/calculations_in_chemistry_dahm_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/9812/8036/files/50045808580.pdf
    • https://cdn.shopify.com/s/files/1/0436/8036/6745/files/83700081576.pdf
    • https://cdn.shopify.com/s/files/1/0451/9854/0949/files/physical_science_college_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/1139/2167/files/calculus_1_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/bitsat_2020_question_paper_with_solution_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/naruto_anime_mod_1._12._2.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/cogitamus_bruno_latour.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/17169239501.pdf
    • https://cdn.shopify.com/s/files/1/0431/3641/7953/files/fapena.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8973/files/reformas_borbonicas_administrativas.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_off000065ba.bin
f1f5ab530ca26874c4a5a084b6941da6fa9d06081be6464aae1ff5dbe78e6058		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 5532 bytes
font_01_sfnt_off00007865.bin
3f9c87a15e9f7948923d63526392666c9abb88b903b03af42a865aa299ff0f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7865 9936 bytes

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