Malicious PDF — malware analysis report

Static analysis result for SHA-256 7412d19acdf03fb8…

MALICIOUS

PDF

52.8 KB Created: 2020-09-03 00:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 238fc1ee382d02c57b4b1653b94695dd SHA-1: 7e758f399a16a74e2c367e0da0cedc60d445f3b3 SHA-256: 7412d19acdf03fb84f2f72661ea555482c8f5bd3aaae42720b6e172ae4e8c31b
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a 'biology lab report' and the malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO manipulation or to obscure the malicious redirector. The ML_NYX_PDF_MALICIOUS classifier strongly indicates malicious intent.

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.ru/pify?keyword=photosynthesis+and+cellular+respiration+biology+lab+report
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/fifajinujasilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7779/files/gokadevamogusazagafenof.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/babiwusitinuvifibog.pdf
    • https://cdn.shopify.com/s/files/1/0438/9679/9384/files/banak.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/living_will_illinois.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/faa_far_aim_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/vikaduxojuwebuvixe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8412/8151/files/sezefelujixag.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/audiophile_magazine.pdf
    • https://cdn.shopify.com/s/files/1/0444/4500/8039/files/calisthenics_workout_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0439/3412/2139/files/vuzisinexa.pdf
    • https://cdn.shopify.com/s/files/1/0437/5543/8234/files/biennial_update_report_upsc.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2513/files/genetics_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9585/files/gumuvezatomulari.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_off000078da.bin
1b39c66a19949fa1202fd09dd6ee5fca865577f412282c3c10f5973742406e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DA 5576 bytes
font_01_sfnt_off00008bce.bin
8c7bd90aedb08e340d7e7c28f80ad525cb7f1f50226186e24c2da4dc173ae524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCE 10772 bytes
font_02_sfnt_off0000b0ca.bin
492b72e9e8f0bcef963ad10e88f80b5598216a8c56d4f3a27963a6a5716a4957		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CA 16084 bytes

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