Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ce37fe8d7057a7…

MALICIOUS

PDF

50.5 KB Created: 2020-08-17 07:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 85db22058c59f27d7eed34c5abf4726e SHA-1: cf4e31a233226c7f9a0f39e36a658dfbd0ddeec5 SHA-256: 83ce37fe8d7057a788e5a65afb338f5a0b5f13dc21a511380e54edc01a39ad9b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text related to probability worksheets and a URL that mirrors the redirector link, suggesting a lure to trick users into clicking malicious links. 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=union+and+intersection+probability+worksheets+with+answers In PDF document text
    • http://files.worcesterdoula.com/uploads/1/3/2/6/132695258/mesemojuvo_tadoxawunuxifeg_xasogumuvi_wiboja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2689/8344/files/anemia_de_celulas_falciforme_pediatria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/nanuwirilosakanizifenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7745/2454/files/facebook_android_app_auto_update.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5660/9957/files/colored_cellophane_sheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89965927340.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/43432789670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/gitigulijalakalufom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2767/6829/files/tikamigokoxerodazogusozuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4663/2615/files/breathe_in_cash_out.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/4483/6252/files/namaz_ka_tarika_download.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 5552 bytes
SHA-256: 098d2f8d7200d450a092a624ee3acea98ebfd7e27dd11d3936905b3387f8a109
font_01_sfnt_off00007f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8F 10820 bytes
SHA-256: 9cd9c4fd5ffeda35ac6f48019d50e1dd61b28e2293d927cf7fc06fb6f332c12b
font_02_sfnt_off0000a4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BF 16328 bytes
SHA-256: b7abed63dd39eac62c8f0b65d71b15cbf880e501586220adc05d5d8067a2f5a9

Open this report in the interactive analyzer, or submit your own file for analysis.