Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dfd8623bbecc91…

MALICIOUS

PDF

47.6 KB Created: 2020-08-19 12:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea4af64a7962a5865caea8651b852145 SHA-1: dce0238043551d91e7d9c3ad7eb0ff7853b815a1 SHA-256: 09dfd8623bbecc91adf0e6aa498c11d0efed6e9daf18ccf7cf372a7955dac22f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a specific malicious redirector URL, suggesting a phishing or scam attempt. The document body, though obfuscated, contains text related to 'vpn chrome android' and the malicious URL, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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/pify?keyword=vpn+chrome+android+%25D0%25B1%25D0%25B5%25D1%2581%25D0%25BF%25D0%25BB%25D0%25B0%25D1%2582%25D0%25BD%25D0%25BE
    • http://files.beccabakerphotography.com/uploads/1/3/2/6/132682882/05df75.pdf
    • http://files.erc-events.com/uploads/1/3/0/9/130970023/2382549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/97999674969.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/xegower.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7952/files/26395905234.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34680977850.pdf
    • https://cdn.shopify.com/s/files/1/0440/5703/4902/files/91034180064.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/something_corporate_konstantine.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/50506194045.pdf
    • https://cdn.shopify.com/s/files/1/0447/8317/3798/files/zavojaperujadides.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0437/files/voucher_entry_in_tally_9.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/20632821935.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_off000056d1.bin
738928a008673b00e1d6b8c9d42a9130d5611c164c3226408bd815a742bbd4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56D1 6036 bytes
font_01_sfnt_off0000698e.bin
f047d19bbe95e46010640e9ec41d05d4da47632d64c29d627d0595e6241c698d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x698E 15500 bytes
font_02_sfnt_off00009a14.bin
9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A14 16092 bytes

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