Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3d019a28c2a60f…

MALICIOUS

PDF

39.2 KB Created: 2020-08-21 02:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1543b17ee9395d55c6ef5723fa5af537 SHA-1: 69c490c55af29dd354ab2c45a5f9c92ce5a780c1 SHA-256: af3d019a28c2a60f13877c5142462ef2ddbdf7087a4a14f47ddd506a680bc202
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though partially corrupted, suggests an educational context ('equivalent fractions answers') which is likely a lure. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content. The ML classifier strongly indicated maliciousness.

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=practice+5-+5+equivalent+fractions+answers
    • http://zuxumomup.diplomainprofessionalstudies.com/uploads/1/3/2/6/132680981/zoleve.pdf
    • http://files.longbeachfelines.org/uploads/1/3/1/3/131381976/tirosakemaxed.pdf
    • https://cdn.shopify.com/s/files/1/0432/3996/4834/files/google_spreadsheet_record_macro.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/viscous_fluid_flow_white_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0460/7324/9956/files/bases_quimicas_de_la_herencia.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/72621108776.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/19460007328.pdf
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/treatment_of_heart_failure.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/android_os_a_to_z.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_off00005b82.bin
d7f4bba13669047fa4f69f6628a0ea1b488d81a47146bc00f8b6a36da6f78165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B82 5308 bytes
font_01_sfnt_off00006dc7.bin
72b0e423af2bc5358a1f949c61d4266f45dce2e7594d303c560db7ca9684db20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC7 10076 bytes

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