Malicious PDF — malware analysis report

Static analysis result for SHA-256 da734dcf47c9679e…

MALICIOUS

PDF

56.0 KB Created: 2020-11-06 17:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 14eac74e0a0b9e0599291ed518850fea SHA-1: 1681677926e8c123820a7dc9bc8227e671236485 SHA-256: da734dcf47c9679e0d360f99bea1ac116b2190ea553ec2c14063468ced5a4328
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/aws?keyword=unblocked+games+500+google+sites In PDF document text
    • https://mupipuko.weebly.com/uploads/1/3/4/3/134370635/lizekudukit_bejarodipir_bixivaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5f8bce8d5a219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383698/normal_5f9fc2f2e2f29.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/3fba6d910.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/mafabo-wijababesi-tugiwogi.pdfIn PDF document text
    • https://sazaxadapu.weebly.com/uploads/1/3/4/3/134330736/343d18fd14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nokiwovowus/fayette_county_schools_calendar_20-21.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/adding_fractions_coloring_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/crest_high_school_in_kansas.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/fizimobaruweboratiweti.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/atmosfera_zanichelli.pdfIn PDF document text
    • https://tuxabavijig.files.wordpress.com/2020/11/37940387668.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4D 5412 bytes
SHA-256: 42c02dd53f96dc5faffec114ba7b6a48fceae8efff60f694626a83af56b482b5
font_01_sfnt_off0000a0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A1 10768 bytes
SHA-256: 17c5d793532c20b7a175d244ba259c57ae4bddea0d8a7cb6e111e2ef480a8bd1
font_02_sfnt_off0000c541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC541 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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