Malicious PDF — malware analysis report

Static analysis result for SHA-256 722c8f9f7982d32b…

MALICIOUS

PDF

49.3 KB Created: 2020-07-29 14:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba037f07a8a391f58f45174fe9822af SHA-1: 42cecc9163f3fd6b068a6b8c001def770453f233 SHA-256: 722c8f9f7982d32b93ac77cc68baa01d121256ccbfded489598528e184bdee57
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational material. The presence of many external PDF links, some pointing to benign Shopify URLs and others to unknown domains, indicates a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier 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/pify?keyword=mitosis+and+meiosis+worksheet+pdf
    • http://files.michaelarubin.com/uploads/1/3/0/7/130738949/nebuk.pdf
    • http://files.bluetorchfinance.com/uploads/1/3/0/7/130775220/15a42ae8.pdf
    • http://files.honkrenaissance.net/uploads/1/3/1/0/131070520/3578f9490c503.pdf
    • http://files.dronkadiscountstore.com/uploads/1/3/0/9/130969545/2646941.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorirazapevimixawas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/bufiresugilevoforuke.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/zexafegefuvosajavexab.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/46514708315.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/78614608691.pdf
    • https://cdn.shopify.com/s/files/1/0436/2623/4009/files/zexejagisutiluzel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/salovukigokepodaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7395/4204/files/86390352276.pdf
    • https://cdn.shopify.com/s/files/1/0440/6955/2293/files/juzepemasoxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/1238/1079/files/kadirupewalesuxokogori.pdf
    • https://cdn.shopify.com/s/files/1/0431/5929/0022/files/finufujerez.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35117459625.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4432/files/6071451711.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5066/files/83074753022.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008394.bin
6059febf76a260b786792a7719e0d5e656be1760fa27c24e38a086a379bc7921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8394 5200 bytes
font_01_sfnt_off00009520.bin
a0a14b306b58876ffd129c9ee16ab2396c6d081e1367b8ab71bbc5afdc4028c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9520 10208 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.