Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fb2be7e687518b…

MALICIOUS

PDF

44.0 KB Created: 2020-08-10 17:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce159668911d2b04ec78e1b1b3e2a4ad SHA-1: 5f34dd4c39aac58bbc4bfa73b9a8e8b8eb832682 SHA-256: c2fb2be7e687518bb3b4ff71d9f6051b1ca0ea9e270f6a320c3dc9fe2040ac25
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a 'jazz bass guitar lessons pdf' and includes the malicious URL. This indicates a phishing attempt to redirect users to malicious infrastructure.

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=jazz+bass+guitar+lessons+pdf
    • http://files.cheezlandukeband.com/uploads/1/3/0/7/130775905/5690117.pdf
    • http://files.dannasdogs.net/uploads/1/3/0/7/130775950/rezipef.pdf
    • http://files.creativealchemy4education.org/uploads/1/3/1/4/131453294/koregodovodazaxe.pdf
    • http://files.pdxprays.com/uploads/1/3/1/3/131383018/wikixawasagi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/molapiwije.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3170/files/94374940374.pdf
    • https://cdn.shopify.com/s/files/1/0429/3450/1535/files/kurixatajizefux.pdf
    • https://cdn.shopify.com/s/files/1/0436/9462/0837/files/dabupan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/67572949107.pdf
    • https://cdn.shopify.com/s/files/1/0440/1732/0094/files/nikon_d7100_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/business_plan_cafe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/87840801126.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/crsu_b._ed_result_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/7522/1157/files/principles_of_auditing_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/weekend_at_bernies.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/livro_completo_alcoro_em_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/95655904093.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • https://cdn.shopify.com/s/files/1/0435/1164/4324/files/examples_of_manual_dexterity.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_off00006a7e.bin
45a99e3cef12554b34408db10e7930e32c730ab147c008d9139435cbeb5de800		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7E 5388 bytes
font_01_sfnt_off00007ce1.bin
c8ad7e5f880169f27abce80b0ef148ef00406489d96d4fff4435257f725f1320		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE1 11028 bytes

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