Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25c1950399b00fc…

MALICIOUS

PDF

34.7 KB Created: 2020-08-26 00:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: e4f1103d9383808c7ed3e62ce22ca6d4 SHA-1: f48cd05e9aeb88dae81d8e7c6de3bcbe5e772352 SHA-256: b25c1950399b00fcd4d75076ae94cff9a70e34a3c4fd77f127be32d6f0782b13
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.me/pify?keyword=welding+metallurgy+textbook+pdf In PDF document text
    • http://files.chelseagilmoreart.com/uploads/1/3/1/4/131407138/3311643.pdfIn PDF document text
    • http://files.jenniferannestone.com/uploads/1/3/1/4/131438808/fe99efa69d92.pdfIn PDF document text
    • http://files.thismarketingspace.com/uploads/1/3/1/4/131483138/vixomatavufuvaka.pdfIn PDF document text
    • http://wenavove.havenhouse1180.com/uploads/1/3/2/7/132740285/pafavenidowexibane.pdfIn PDF document text
    • http://kofepona.rosaferrara.net/uploads/1/3/1/4/131453540/tofanavojazi-lirosorovexif-wulimudi-jufenanew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/mowufulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5887/2998/files/14._3_human_genetic_disorders_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/44644078819.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/4374/1845/files/advantages_and_disadvantages_of_green_technology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9879/0301/files/12109336172.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/remanugaberexomujutuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8770/8825/files/vebolakaliw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8094/1729/files/kobatujinunaz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4953 5572 bytes
SHA-256: 4d648b925da87320905eec36c1fcf69d32091431aa76b39d3b5806b5ac42fa68
font_01_sfnt_off00005c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3B 9928 bytes
SHA-256: 1cada1a6c74f708fe40f45f0c9a57193adf0e0acf634ee0e0e6f4f2089cee692