Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e6f9c819db8b20…

MALICIOUS

PDF

43.6 KB Created: 2020-07-08 16:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: fbbedecd427e2c885d30d33b5f854130 SHA-1: be930140cd24187b383e2fcde2dd8cb2729a4d27 SHA-256: 12e6f9c819db8b20fcda6174b4d4c08d3c6bd1acee01f4ab34f03ee2d40debaf
194 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to redirectors and potentially malicious domains. The document body text and heuristic firings indicate a lure related to a "shapes coloring worksheet" which redirects users to external URLs. The ML classifier strongly indicates maliciousness, and the presence of redirector links suggests an attempt to lead users to a phishing or malware download site.

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=shapes%20coloring%20worksheet In PDF document text
    • http://files.vcgallery.org/uploads/1/3/1/8/131856381/rokererukirejakifu.pdfIn PDF document text
    • http://files.phidecatheta.com/uploads/1/3/0/9/130970014/matoganojesi.pdfIn PDF document text
    • http://files.chevron.ie/uploads/1/3/1/1/131164007/tirovozenawer.pdfIn PDF document text
    • http://files.dlfinancial.org/uploads/1/3/1/3/131379749/tobij.pdfIn PDF document text
    • http://files.soulflowerhealing.com/uploads/1/3/0/8/130873987/tugipolaxit.pdfIn PDF document text
    • http://files.dianekatzman.com/uploads/1/3/1/8/131855992/xufonekijexas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ginirosidu.files.wordpress.com/2020/06/91440079011.pdfIn PDF document text
    • https://pudaditi.files.wordpress.com/2020/07/titolebubalebodopit.pdfIn PDF document text
    • https://gitaxafepuwo.files.wordpress.com/2020/06/58106013761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jatud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98973723668.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD4 5244 bytes
SHA-256: 9d92f06523e6c06d7e88886764e13e667d2fe83810475ac4d7ef1dd2993e1a51
font_01_sfnt_off00007fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA3 9932 bytes
SHA-256: 689bcd40e42839c45c3f3204c96181c0025c92c2a70b229f97fe8c176e82975d

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