Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efaa9bc22813135…

MALICIOUS

PDF

37.5 KB Created: 2020-08-17 10:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8a83ac2d16f5e077de98edce33bb7cd6 SHA-1: 4aad8910f8f7134e1e90afdf7a72929213c11a5f SHA-256: 7efaa9bc2281313591f0cbd937ca87dcf9865465984dc3569b4cba097c59a0d3
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous links, many pointing to a redirector service, suggesting a phishing or malware distribution scheme. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing something, which is a common social-engineering tactic. The presence of embedded URLs and the ML classifier's high confidence further support a malicious intent, likely to download a second-stage payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=i+am+an+albatross+song++320kbps In PDF document text
    • http://files.ahnorthodontics.com/uploads/1/3/1/3/131383657/1631433.pdfIn PDF document text
    • http://files.detailersdirect.co.uk/uploads/1/3/2/8/132815785/dinaxotegosokelumabu.pdfIn PDF document text
    • http://tunowox.toymigos.com/uploads/1/3/1/4/131483109/7358136.pdfIn PDF document text
    • http://files.communityproblemsolvingday.com/uploads/1/3/2/8/132814071/nokigusoto.pdfIn PDF document text
    • http://tavofukix.rachelflynn-art.com/uploads/1/3/1/6/131637136/dca03c0383.pdfIn PDF document text
    • http://viltipenpu.datingvr.ru/?dl&keyword=download+i+am+an+albatraoz+mp3+320kbps&aIn PDF document text
    • http://viltipenpu.datingvr.ru/?dl&keyword=download+i+am+an+albatraoz+mp3+320kbps&aIn 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/1/0431/4651/0504/files/bikini_body_guide_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5749/4686/files/telugu_letters_practice_sheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/heavy_wool_bandage_vanilla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/21216262914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/72552312613.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5066/3062/files/medobalifonomevofolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1656/0550/files/cardiovascular_endurance_exercises.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9080/4893/files/pdf_max_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/86301086381.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8205/5833/files/mezapizivoduvipenanog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/27366237350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2913/4501/files/32682477500.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_off00005401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5401 5720 bytes
SHA-256: 5f1fc22ca506503212a95edb1f2426f7f67d4f7d42f056ff83303575db600dfd
font_01_sfnt_off0000675a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675A 9904 bytes
SHA-256: 464092d6829d9118e6eb688d33b9b16a95ddb50e36789cc218d55a1231901e08