Malicious PDF — malware analysis report

Static analysis result for SHA-256 78df0a1fd73816b2…

MALICIOUS

PDF

43.7 KB Created: 2020-08-19 16:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dab690fabf2f338f5125cd0d35458147 SHA-1: 2c6270b3254745a840314575b45867035c892526 SHA-256: 78df0a1fd73816b20f1a70c3e9eab2e592fb0a020972dd004af6a4cc8a89169d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=free+flowchart+template+google+docs'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for a 'free flowchart template'. The presence of a 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests an attempt to trick the user into executing commands, potentially to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=free+flowchart+template+google+docs In PDF document text
    • http://pozigo.flywithlevi.com/uploads/1/3/0/8/130813528/575927.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/1/0437/4914/6778/files/derrida_deconstruction.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87664315042.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/games_workshop_armies_of_the_lord_of_the_rings.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6150/8256/files/test_adsl_vodafone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7446/7478/files/makkar_ielts_writing_task_2_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9438/3522/files/cbse_class_12_biology_syllabus_2020_20.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7344/5792/files/5354805350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6868/6497/files/67126604127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3997/1738/files/gurumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/mapefive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/nulejetusibozekiruxupixek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0941/6095/files/inorganic_chemistry_atkins_shriver.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/scratch_2._0_offline_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0F 5616 bytes
SHA-256: b30c18a94014b1451549626e6595586b17ad97430522ac93a96976a4207f3a60
font_01_sfnt_off00007e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1B 10352 bytes
SHA-256: 781197073a6cbf1d4fe4f592c4cb0be255b1f6c8e5652ca0ebea705abf543b82

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