Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ba6e8a207010bd…

MALICIOUS

PDF

45.7 KB Created: 2020-08-14 13:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e98083872687ae8315a8d125a983c450 SHA-1: ef93681c5d1fd4857f68fcf2002fe707fa9122a3 SHA-256: 36ba6e8a207010bd7a4ca748789846743218ffec95e2db035c71dcaa96dca85b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a high number of embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and a title suggesting a product manual, likely a lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic suggests a tactic to manipulate search engine results or distribute malicious links.

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=ar+condicionado+portatil+comfee+9000+btus+manual
    • http://files.hinghamspeechtherapy.com/uploads/1/3/2/7/132740485/4272081.pdf
    • http://files.kimhirtunit.com/uploads/1/3/1/8/131871657/4557431.pdf
    • http://gosujanu.laurenmmcollins.com/uploads/1/3/1/6/131607600/tokuxafaker.pdf
    • http://files.writingonreels.uk/uploads/1/3/0/9/130969966/2bb58a8b60.pdf
    • http://files.graceub.com/uploads/1/3/2/6/132681404/6733747.pdf
    • https://cdn.shopify.com/s/files/1/0449/7873/3224/files/kirchhoff_s_first_law.pdf
    • https://cdn.shopify.com/s/files/1/0435/2838/8772/files/mettler_toledo_ind560_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4743/4905/files/best_app_to_annotate_windows.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6549/files/zimojefataxebodixe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/77617594817.pdf
    • https://cdn.shopify.com/s/files/1/0435/6741/5457/files/sat_math_level_1_practice_test_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/viguvi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8672/5799/files/wiriwamalakis.pdf
    • https://cdn.shopify.com/s/files/1/0441/2728/9496/files/53242585791.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/84130420793.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/kodofa.pdf
    • https://cdn.shopify.com/s/files/1/0440/7354/9974/files/61724399708.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_off0000728d.bin
20edefeb11faba49cf8cd670d0f115277af804898164723a13fbaba093ba7f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728D 5728 bytes
font_01_sfnt_off000085e1.bin
d400b17d914b2cc55101b589fcc0c8f2c2482f6d2f40cca6c4c9dff67067ea44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85E1 10352 bytes

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