Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6b648dcf5b0c53…

MALICIOUS

PDF

49.1 KB Created: 2020-08-29 10:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e214dd730b86051c033355467c38f820 SHA-1: ffd65544d8c67d50b9a52509be1dc269b103b973 SHA-256: 7b6b648dcf5b0c538f8f65450ee622e60ab2c549d5de4bc7a58f50fa5b0deae3
154 Risk Score

Malware Insights

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

The PDF file contains a lure disguised as a resignation letter, which directs the user to a malicious URL. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of the URL in the document body strongly indicate a phishing attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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.com/wix?keyword=sample+of+resignation+letter+due+to+health+issue
    • https://cdn.shopify.com/s/files/1/0434/0819/5738/files/58308091712.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/wedopupazimuzoperizati.pdf
    • https://cdn.shopify.com/s/files/1/0440/5005/5318/files/kufebuwinegirerejiru.pdf
    • https://cdn.shopify.com/s/files/1/0434/7294/5304/files/divx_dolby_audio_edition_serial_numb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8cfdd0b7e7d74c2eb51e171d6d389418.pdf
    • https://static.usrfiles.com/ugd/b8c837_b02db221a2d74e26a087e71b3529771d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d71be1e5321a4eb18819c86c033dffa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbbfd0603f3e4887bbdb92b5c4ab1d31.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5eccc9b80a5459c9e43c2885ebfc1c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f47f62f9f354b58b6213d2f9cf468d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f13fae499f047edbe01084afffde4bb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/pipasiwa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0604/files/7069955782.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9902/files/free_classic_solitaire_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/0845/6865/files/madibasad.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076ad.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76AD 2828 bytes
font_01_sfnt_off000080a8.bin
1bcc871772b7698c4835a29f984c4caed13d2376c1a3524278464d86da124072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A8 5560 bytes
font_02_sfnt_off0000935a.bin
104e38e001a9f249e58699f2890b149a8b0c9178e72a57f8b0d9ae148ef437c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x935A 9776 bytes

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