Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c765111fe97992…

MALICIOUS

PDF

41.9 KB Created: 2020-09-18 00:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11d3b30bc16a35a499406e8a7299ce29 SHA-1: f8328ac875650ff9f4395133473a3d81649cddeb SHA-256: a8c765111fe9799245187fbcac46d7f27ca972d3979f531155e9796619bdac6e
92 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially obfuscated, contains text related to 'limits at infinity worksheet' and a URL that appears to be a lure. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.me/pify?keyword=limits+at+infinity+worksheet+with+answers+pdf
    • http://files.transcend-ed.com/uploads/1/3/1/6/131606431/2291430.pdf
    • http://files.abundantlifecentrebsn.com/uploads/1/3/1/0/131071243/rudupexofavoji.pdf
    • http://direr.procuity.com.au/uploads/1/3/1/3/131379732/3000343.pdf
    • https://362ac17f-eef8-4e05-9f9e-bfb525dabd19.filesusr.com/ugd/008e52_aacbcdff0aa542d583fbc29985376e68.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/65160591429.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/75002875449.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/xegamabufurer.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/impossible_quiz_answer_26.pdf
    • https://cdn.shopify.com/s/files/1/0433/1703/5166/files/army_apft_score_chart.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054a1.bin
8c22110023c357cd2fef99ca791c153afdd91fdd887162ec0c8524edaa3009f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54A1 5236 bytes
font_01_sfnt_off00006658.bin
51afb5bf789b4684d79289b323a8543413c9d1910f7639810efe426aa1eb4aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6658 11204 bytes
font_02_sfnt_off00008cc0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC0 4324 bytes

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