Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd116aeeaa6e142…

MALICIOUS

PDF

41.9 KB Created: 2020-08-25 05:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3834cfb7991907dfbd91647e2fab3983 SHA-1: 359898a64d60cd0615048c938d36a9fdb015789c SHA-256: 4fd116aeeaa6e1423efee1e8484bbe26a46d0a34fb7930734166b45c762d8730
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external PDF links, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was largely unreadable binary data, but the presence of the malicious redirector URL is a high-confidence indicator of 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.com/pify?keyword=modello+asseverazione+di+conformit%25C3%25A0
    • http://pizev.deerrunwinery.com/uploads/1/3/1/6/131607305/83fc81067dd9.pdf
    • http://files.seungjunlee.org/uploads/1/3/1/6/131606111/7898298.pdf
    • http://files.nancyjoenterprises.com/uploads/1/3/1/3/131380163/zulivovifevo_jideravoru_jugewowi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6594/files/67265230283.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9833/files/bakozagawegikamiruvef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/plant_biotechnology_in_agriculture.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5888/files/pevizenofixaseno.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/32199098232.pdf
    • https://cdn.shopify.com/s/files/1/0459/9942/3647/files/76850618073.pdf
    • https://cdn.shopify.com/s/files/1/0429/3538/6265/files/88203072157.pdf
    • https://cdn.shopify.com/s/files/1/0431/0974/4789/files/63165270638.pdf
    • https://cdn.shopify.com/s/files/1/0428/2790/7239/files/53436195199.pdf
    • https://cdn.shopify.com/s/files/1/0432/2449/8333/files/67950690659.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/tuxofotit.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/37016664227.pdf
    • https://cdn.shopify.com/s/files/1/0437/5999/2990/files/bituxamupiwudakarewabe.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_off00005633.bin
46c46fc6e2c876ef6a82d7b3282e65f7a012a9291b81210fb7d756b5cea3da2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5633 5304 bytes
font_01_sfnt_off000067a7.bin
04680476c7f6b6d7e57993facc459f3659588ae7d2236f07280945450cb545e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67A7 10564 bytes
font_02_sfnt_off00008a80.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A80 4324 bytes

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