Malicious PDF — malware analysis report

Static analysis result for SHA-256 80df711c2b2b898b…

MALICIOUS

PDF

40.6 KB Created: 2020-08-31 14:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df4f2fe0fc8370b682bfeb2c60f577d8 SHA-1: eb3576e6cb7792738d9e38374da61f0dfe802d89 SHA-256: 80df711c2b2b898bb01a88ea6ceef900d61efdb124d800ea44050389cab3f129
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector identified by heuristics. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=geeksforgeeks+java+tutorial+pdf
    • https://cdn.shopify.com/s/files/1/0440/2891/9973/files/automated_guided_vehicles_future.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/rapobujakinibu.pdf
    • https://cdn.shopify.com/s/files/1/0459/1285/0581/files/appreciation_certificate_template_powerpoint.pdf
    • https://cdn.shopify.com/s/files/1/0434/1451/9966/files/29372292301.pdf
    • https://cdn.shopify.com/s/files/1/0433/4839/4143/files/jerigalamaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/verb_have_has_had_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0433/7709/8902/files/bevugubinenita.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31321710084.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1637/files/nes_super_mario_bros_rom.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/ravibilodubirotibekonag.pdf
    • https://static.usrfiles.com/ugd/b8c837_695ba211d7f043d898ec67f7cbd7a68f.pdf
    • https://static.usrfiles.com/ugd/9374a7_15fb7ccf93ab42e1b5c0e3b188ff6a2a.pdf
    • https://static.usrfiles.com/ugd/5be868_180bd54cc3cb45438ceace3b60a6c4bf.pdf
    • https://static.usrfiles.com/ugd/93c935_fb3146c02c3742fb88f3494725a7adc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ce93d7e56684d80976aec5ef8e902b1.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/resorekewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/fancy_reba_lyrics.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a7.bin
6c1a82aef35ebbcb7eec3164b822b7ec00176abe7517fac600fbc929dd97cd4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A7 5440 bytes
font_01_sfnt_off00007350.bin
6f6b31ceda0e083d387a29495eee6492ec1eb0db086789513ce07bd3ed444828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7350 10064 bytes

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