Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef55eaa82b93298d…

MALICIOUS

PDF

40.3 KB Created: 2020-08-20 08:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b904fdf58e4bb750a9c0adc096a928b SHA-1: 893db0d9473e3a2cf23369e8370adb8875c7c195 SHA-256: ef55eaa82b93298dca660b08961bd2ae6f62d52a8015a261a0e56706c8a512c3
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to 'https://ttraff.cc/pify?keyword=calculations+in+excel+sheet'. This suggests the document is designed to lure users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier also 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=calculations+in+excel+sheet
    • http://files.pathwaytoadedu.com/uploads/1/3/2/7/132741194/4231475.pdf
    • http://files.donstrasburger.com/uploads/1/3/2/7/132710779/2451367.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/aviva_singapore_travel_insurance_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/fobupixo.pdf
    • https://cdn.shopify.com/s/files/1/0447/9402/0000/files/google_spreadsheet_count_if_not_empty.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19441108854.pdf
    • https://cdn.shopify.com/s/files/1/0431/7678/8117/files/mobile_automation_testing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gadawatozuwagujezudoru.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/duxoziniforilagadi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/pekogikijatilowezemaviren.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/12261907090.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/28702171978.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/65431072319.pdf
    • https://cdn.shopify.com/s/files/1/0430/7560/0535/files/27791146989.pdf
    • https://cdn.shopify.com/s/files/1/0445/4960/3487/files/ntsi_defensive_driving_course_answers.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_off000061be.bin
4eef0f99cb050de54a2e290ccd89714056f8ee7129116a8eee52639a5bc55d12
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 4764 bytes
font_01_sfnt_off000071ed.bin
15369ccaf1d23431175ed59afcf5afe2b69b29ed2f58b5456c06333acac4391e
pdf-font-stream PDF embedded font (sfnt) at offset 0x71ED 10180 bytes