Malicious PDF — malware analysis report

Static analysis result for SHA-256 b538d1000206af86…

MALICIOUS

PDF

41.7 KB Created: 2020-08-08 03:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2945ec15535cb441fe3f2fdebff25fb6 SHA-1: 608edd68bfd10c79d01ceacde9b3d9f75ba23327 SHA-256: b538d1000206af8665b773b039cd54d8694e89fa92d9872575741559aed03409
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=diploma+applied+mathematics+2+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful sites. The presence of a PDF link farm heuristic further supports the malicious intent by suggesting the document is part of a larger scheme to distribute malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=diploma+applied+mathematics+2+pdf
    • http://gifulire.kofc420.org/uploads/1/3/0/7/130740510/9b12d89.pdf
    • http://diselezi.steinwaywhisperer.com/uploads/1/3/1/4/131482975/8370170.pdf
    • http://nepitisi.aforactive.co.uk/uploads/1/3/2/6/132681946/sepasamujike.pdf
    • https://cdn.shopify.com/s/files/1/0434/0652/4583/files/programacion_de_base_de_datos_sql.pdf
    • https://cdn.shopify.com/s/files/1/0440/5464/2853/files/70159281186.pdf
    • https://cdn.shopify.com/s/files/1/0438/5007/2224/files/87195231045.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1539/files/ielts_reading_academic_band_9.pdf
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/matrix_rotten_tomatoes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/sinus_tarsi_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/31871203471.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7990/files/16726560960.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/biography_of_famous_personalities.pdf
    • https://cdn.shopify.com/s/files/1/0435/9149/9935/files/tugojeziwiwaku.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_off000062dd.bin
99759fa5638dc89a54d68aafea5e03364312e79576584a587072ce7b827c04ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x62DD 5432 bytes
font_01_sfnt_off00007535.bin
ad811bffcd792f3dcfed13251ad0af67bb947045573075d4b98370c213eb0d6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7535 10836 bytes