Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa615c4951b8d04…

MALICIOUS

PDF

48.1 KB Created: 2020-08-17 15:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11d712fbbbbbf8651f978f64cc607379 SHA-1: 9d19b8bdf4fa9e315ad89e87da37763d5ecd1120 SHA-256: 0fa615c4951b8d04451aba1ac1c2366e3f0e64ef69fe8b5c78c4cc63ed730d7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service that ultimately leads to a malicious URL. The document body, though heavily obfuscated, contains text related to 'fishing report' and the malicious URL itself, suggesting a lure to a phishing or scam page. The ML classifier also strongly indicated maliciousness.

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=fishing+report+colorado+river+matagorda
    • http://nolavedok.mx.reinventing-reality.com/uploads/1/3/0/8/130874493/81e37936.pdf
    • http://punutifu.berjarealty.com/uploads/1/3/0/7/130775934/punogulenazuw.pdf
    • http://files.12250parkway.com/uploads/1/3/1/4/131482821/fcc42d3bd09d09.pdf
    • http://files.scw9.ca/uploads/1/3/2/6/132682905/2cb92fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3356/5096/files/10681126471.pdf
    • https://cdn.shopify.com/s/files/1/0437/6779/1765/files/59548874169.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/advanced_english_grammar_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/bonafide_student_certificate_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/20869208132.pdf
    • https://cdn.shopify.com/s/files/1/0430/9185/3479/files/98879436844.pdf
    • https://cdn.shopify.com/s/files/1/0436/5818/2809/files/bolt_and_nut_torque_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/55486856422.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/45725027578.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sujufizolotedugogu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1615/1455/files/komigawoniridomaviveda.pdf
    • https://cdn.shopify.com/s/files/1/0433/2004/9822/files/15008340802.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_off00006615.bin
3acc928a667f1be207a75d2588ab179699ab0d0e109d8bbdc9ff22240e003e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6615 5500 bytes
font_01_sfnt_off0000789e.bin
0233cdd4cd57d223c0fa567d571b4b777b410d51223a2611d408106dbf28bbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789E 10680 bytes
font_02_sfnt_off00009d77.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D77 16312 bytes

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