Malicious PDF — malware analysis report

Static analysis result for SHA-256 27be5e8ed7539f18…

MALICIOUS

PDF

44.6 KB Created: 2020-08-18 22:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d12e3fb9000f897aa735434b120b7ba6 SHA-1: 1d80b3ba70adc3e360bb77fb2dd3b5e54ec060eb SHA-256: 27be5e8ed7539f1889b00b7716ef133dbdab11420b568da81652a28ba35d2b41
152 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.ru/pify?keyword=nuklearna+fizika+pdf'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on Shopify but point to potentially malicious PDF files. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, suggesting an attempt to lure users to malicious content.

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=nuklearna+fizika+pdf In PDF document text
    • http://files.airpro-1.com/uploads/1/3/1/3/131381352/wukosubeju-xigabuwukoduw.pdfIn PDF document text
    • http://files.bolingbroke-writers.org/uploads/1/3/1/6/131606563/753224.pdfIn PDF document text
    • http://bilob.memphisactivismcalendar.org/uploads/1/3/2/3/132303359/773a64322f4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3262/4797/files/mechanical_advantage_of_a_wheel_and_axle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4686/0957/files/ayyappa_dj_songs_audio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/chinese_food_recipes_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/68936669924.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8361/2831/files/36080231099.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/99931364614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/biralavanenesufuvesawe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1804/2018/files/guxiripudaxujoxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7853/3799/files/bovidodogi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/amelie_soundtrack_piano_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9341/7367/files/sample_email_format_for_job_application.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/jujixofevixixilevadeji.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006549.bin
87c0b09eb57b377a2cc36fb0401309afe34965df63a9cda82d42a512934ce2db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6549 4632 bytes
font_01_sfnt_off00007513.bin
3076f7923b65f671ae1d3b51eece0789f884ad7c44976725e05c8e555b01f5aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7513 10096 bytes
font_02_sfnt_off000097a1.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97A1 4324 bytes

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