Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e5ab43ee9f9f09…

MALICIOUS

PDF

42.4 KB Created: 2020-08-26 18:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a384a9851a1aa8ddd2883f4efd9f1d93 SHA-1: 73bdd8d68f81f6b50be7f7d0da25abfe9230df88 SHA-256: 18e5ab43ee9f9f0928bae8f9a78378690005b6d3dd73a2e139ad05baffa22168
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Tampering

The PDF contains a malicious redirector link disguised as a download error, aiming to trick users into clicking it. It also explicitly instructs the user to disable security software, indicating a clear intent to bypass defenses. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=failed+download+error+needs+authorization
    • http://files.calacascalifornia.com/uploads/1/3/0/8/130873923/sesabuximon.pdf
    • http://files.djconsuelo.com/uploads/1/3/1/3/131379591/difikuz.pdf
    • http://rorupol.thecatsmeowtarotandtalismans.com/uploads/1/3/1/0/131070027/9267947.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8691/2413/files/acer_aspire_one_zg5_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/28052227285.pdf
    • https://cdn.shopify.com/s/files/1/0433/4275/8056/files/github_pull_request_workflow.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5461/files/nigemixulokexaxelap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3203/4976/files/b_a_pass_2017_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/68799811461.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/resovor.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/wemodarosevugimare.pdf
    • https://cdn.shopify.com/s/files/1/0440/1407/6069/files/gexaduban.pdf
    • https://cdn.shopify.com/s/files/1/0437/6556/3549/files/catholic_bible_study_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/3128/1312/files/bunonudu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/didabevevofu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/balanza_de_comprobacion_ejemplo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6806/files/basic_engineering_circuit_analysis_9th_edition.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_off00006924.bin
dc95f0f57b233b955838819d5ae394ae29895d131c21ee0a9e5d54b1656e2c74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6924 5012 bytes
font_01_sfnt_off00007a3d.bin
a280d1e8da2bf6fc78b9be15ad2b6e34683259ed66810357a2baa3ef4856b1f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3D 10148 bytes

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