Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8cb63fe6c03a63…

MALICIOUS

PDF

47.8 KB Created: 2020-07-27 03:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: a87e09ec30bbedb0aaaac462fa5f7596 SHA-1: c2c56f187023f8961a88974b0574fdf4d61310d5 SHA-256: ef8cb63fe6c03a635fd769334ba07b14377ef64ed3e60ece147b4f5e775d5356
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.cc/wb?keyword=developmental%20milestones%20for%202%20year%20olds%20pdf`. Another critical heuristic identified a PDF link farm, with many links pointing to `cdn.shopify.com` domains. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its intended lure.

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.cc/wb?keyword=developmental%20milestones%20for%202%20year%20olds%20pdf In PDF document text
    • http://files.steephill22.com/uploads/1/3/0/9/130969817/bufifotijo_vitoduk.pdfIn PDF document text
    • http://files.1small-step.com/uploads/1/3/2/3/132302780/1417e32fab.pdfIn PDF document text
    • http://files.breakalegman.com/uploads/1/3/1/3/131381021/28be0a2d80a3ffb.pdfIn PDF document text
    • http://files.planetstompers.net/uploads/1/3/0/8/130814279/jafumabe_kuvevot_zufatinuwinoxi_tizax.pdfIn PDF document text
    • http://files.spirituality-conference.org/uploads/1/3/1/4/131409200/2457497.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/1/0431/3025/7568/files/dixatojugum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6353/1933/files/rupefamasedafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6103/5686/files/gunediguwadurikadokejaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/dudopamobizojezagegib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4655/2230/files/xipiledaxupusuxifoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/kagutujapuvaxajabovage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/60759459349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3503/2737/files/fobejofizuretopev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/gajinijaginanoniloxaguw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/jivugejeradedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3943/8501/files/pativotelom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/tadoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3760/5544/files/fugewinejafifakujazane.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_off00007dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC7 5268 bytes
SHA-256: a032d2284b1e9e20048116fa81628c65c32db825c68bb825850b6626a4c6bc74
font_01_sfnt_off00008f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F9F 10020 bytes
SHA-256: 1fa365bb00b4bcdd91603e57b79b4eeb0b86c25d269d181c7447424f1653e1dd