Malicious PDF — malware analysis report

Static analysis result for SHA-256 816af172cc31041b…

MALICIOUS

PDF

71.8 KB Created: 2020-08-25 11:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c13a208b649cef20abc829992daf4f83 SHA-1: 4a5dc574e3e6aa77b28c889b1df9e5cbe6f916b2 SHA-256: 816af172cc31041ba9f71fc53c1a18c75f9c5c0d82c312a9ac2dd12e0aec389f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded links to a known malicious redirector, ttraff.com, which is a strong indicator of malicious intent. Additionally, the document body contains a lure instructing the user to copy and paste content into a shell, suggesting an attempt to trick the user into executing commands. The ML classifier also flagged this PDF with high confidence.

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.com/pify?keyword=android+studio+bash+adb+command+not+found
    • http://files.brittbuirs.com/uploads/1/3/0/8/130814193/nubegas.pdf
    • http://gazumu.klarahomes.co.uk/uploads/1/3/1/1/131164250/rikavuf.pdf
    • http://sibox.familiesinfaith.net/uploads/1/3/1/6/131636725/diwezegewisibevur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1888/7068/files/materi_batuan_beku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/azure_active_directory_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/6851/3695/files/lubokadefugivarep.pdf
    • https://cdn.shopify.com/s/files/1/0429/3787/6639/files/ritozusakufuwixotara.pdf
    • https://cdn.shopify.com/s/files/1/0435/7285/4939/files/create_branch_in_github.pdf
    • https://cdn.shopify.com/s/files/1/0437/7339/5101/files/upsc_optional_subject_sociology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/51265765591.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcc6.bin
8060b42d1c28ad5028d894dbbd88044c21720e7cd67398456af0e243a647eb43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC6 5356 bytes
font_01_sfnt_off0000cecb.bin
6de3c22967000de01ffaf579a0e745469522cc39db65273d29dc1266db9ee694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 14176 bytes
font_02_sfnt_off0000fc53.bin
0c82561ead172ac0e51412abe629b5944d5f81f469066018c017fef234fe4ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16388 bytes

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