Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8887a712cbf65ce…

MALICIOUS

PDF

37.5 KB Created: 2020-08-31 11:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 159bfe08c40e8947f33effc140a361c6 SHA-1: 126421a0e757738600478972691d30d75db30bbb SHA-256: c8887a712cbf65ced19eb21a9a72c8cfdbc979f93c9528d08c83e4db203082b9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for watching a movie online. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a spam or SEO poisoning campaign. The ML classifier also strongly flagged this PDF as malicious.

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.ru/wix?keyword=tom+and+jerry+the+lost+dragon+watch+online
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/voragugefavinuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9512/1319/files/nulitufixopekege.pdf
    • https://cdn.shopify.com/s/files/1/0428/3272/4124/files/92689919552.pdf
    • https://cdn.shopify.com/s/files/1/0435/6338/4991/files/20253648628.pdf
    • https://static.usrfiles.com/ugd/4dd980_f702e9b5a93d47b485b7c615082a0763.pdf
    • https://static.usrfiles.com/ugd/9e53d4_4716f71cc9dc4c42872aa266216fff2e.pdf
    • https://static.usrfiles.com/ugd/3b47cb_bac16f45731347e7bff380a238f8f913.pdf
    • https://static.usrfiles.com/ugd/10b11f_9de11be6d5a8440a9d496f4f842ccbb4.pdf
    • https://static.usrfiles.com/ugd/b88e3d_9a6f315fbfb44666a3d531c5248d4fc2.pdf
    • https://cdn.shopify.com/s/files/1/0431/7406/8390/files/boot_process_in_windows_server_2008.pdf
    • https://cdn.shopify.com/s/files/1/0431/2068/9306/files/rabidanirodifinadifuvakuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/81342250110.pdf
    • https://cdn.shopify.com/s/files/1/0434/2421/9293/files/xabomogozazo.pdf
    • https://static.usrfiles.com/ugd/6cf392_e30873439d6a419ba9e90929985d103a.pdf
    • https://static.usrfiles.com/ugd/b8c837_af3fb698941c4120bcebc329ca68dcf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ee411929aed468eaa0a2edda25113f1.pdf
    • https://static.usrfiles.com/ugd/0c41e7_54c40acca8be46a88183ae14a66f2a7f.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_off000046b5.bin
b6aad54f7a7675f30282c4a3850ff107b4af9a29966912e290519ce7542c2d68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46B5 5360 bytes
font_01_sfnt_off000058cf.bin
ade4e173148cfa5f6bbd1add2208baebc009f68cb278621b1598e44efe704acb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58CF 9828 bytes
font_02_sfnt_off00007a89.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A89 4324 bytes

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