Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ae6ca85462433e…

MALICIOUS

PDF

127.2 KB Created: 2020-07-20 03:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 5e3152301bc38643e12b0beac548c34a SHA-1: 67a5a164f7cb6733460ef2c417d2ec4bc4ffc12a SHA-256: 09ae6ca85462433efcf94f68ceca6449fc4ca80df2d55dc622eb1b1c4ddede50
194 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to redirector infrastructure. The heuristic firings indicate that the document is designed as an SEO link farm, likely to distribute malware or phish for credentials. The primary redirector URL is https://ttraff.cc/wb?keyword=delphi%20language%20guide%20pdf, which is a common lure for free downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=delphi%20language%20guide%20pdf In PDF document text
    • http://files.dakotadesigns.net/uploads/1/3/0/7/130740493/jilakeveluked_nerewezidijabuf_zirite.pdfIn PDF document text
    • http://files.sfa-am.ch/uploads/1/3/1/3/131384135/wolekidadabo.pdfIn PDF document text
    • http://files.theamaniconsort.com/uploads/1/3/0/8/130813923/zurudumimukedaboku.pdfIn PDF document text
    • http://files.ch8sapscience.com/uploads/1/3/1/8/131856331/9116327.pdfIn PDF document text
    • http://files.bloomfieldhillsskiteam.com/uploads/1/3/0/7/130776728/429f9498f.pdfIn PDF document text
    • http://files.voiceofjonescounty.com/uploads/1/3/0/8/130873965/68b928e756.pdfIn PDF document text
    • http://files.katiefrenchbooks.com/uploads/1/3/0/7/130775221/422b3d9ea54bf.pdfIn PDF document text
    • http://files.mirkesinsurance.com/uploads/1/3/1/6/131637477/5542630.pdfIn PDF document text
    • http://files.graceacuherbs.com/uploads/1/3/0/7/130775292/kumijev_nuvirikew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bozuveser406651832.files.wordpress.com/2020/07/somufuxijixivokinoge.pdfIn PDF document text
    • https://jezalur.files.wordpress.com/2020/07/53987863174.pdfIn PDF document text
    • https://losokud.files.wordpress.com/2020/07/kesixamimukukonodowa.pdfIn PDF document text
    • https://sirupipes.files.wordpress.com/2020/07/94507186813.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4571/6129/files/32199935978.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/9713427839.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/6912246670.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/putimuxolegut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3706/4354/files/wiwivesutezurapinukugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0709/0581/files/wojez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8080/1701/files/wulodagame.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/nejesulo.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_off0001af12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF12 4720 bytes
SHA-256: 1db0b7d5ba8e11f1e9f4d55e3898b221cba4891dff1dea1553f986e4e6b17695
font_01_sfnt_off0001bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF10 15368 bytes
SHA-256: b4dc2259b1e180d9717c722ba7191a06e1c582ea7a869aef6d0143c8cef0cf66