Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2538de12d269f8…

MALICIOUS

PDF

37.2 KB Created: 2020-07-20 20:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 76adeaec707f68a6a2d2fd2dd8716eb4 SHA-1: 78fd25a19772b4423ab76b8612d253ec6fb1dc10 SHA-256: 1c2538de12d269f8482b121e076c616c83bf3b1950b694b600b8b9d2168677fa
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wb?keyword=superhero%20outline%20template%20pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to manipulate search engine results or distribute content across multiple domains. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the exact 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=superhero%20outline%20template%20pdf In PDF document text
    • http://files.theriftny.com/uploads/1/3/1/3/131384492/junogaxal-duxajokibusaso-fakinubi-bazefelap.pdfIn PDF document text
    • http://files.losangelesaazk.org/uploads/1/3/2/7/132740756/bezexuzaw.pdfIn PDF document text
    • http://files.naturallysport.net/uploads/1/3/1/4/131410479/muziwazavifobeb.pdfIn PDF document text
    • http://files.brianelassiter.com/uploads/1/3/1/4/131483279/kiromogiv.pdfIn PDF document text
    • http://files.missrodeowashingtoninc.com/uploads/1/3/0/7/130776399/weziluvoxoda.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/1/0432/5477/5970/files/43066648994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3105/1931/files/ruzaluletubegidum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/19403888122.pdfIn PDF document text
    • https://lovosofu483699639.files.wordpress.com/2020/07/68383271975.pdfIn PDF document text
    • https://vadirukirog.files.wordpress.com/2020/07/36477045840.pdfIn PDF document text
    • https://takipeximon.files.wordpress.com/2020/07/1897962400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/dafad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/98964192023.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/nabelop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/xodomuwusixol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2131/1898/files/91795199406.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/83976063474.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/jipafafixulugona.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72163988246.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_off000056b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56B5 5088 bytes
SHA-256: b7ceea319e9455f8b8142b0085b818d386b692fd62c06ec76a96c22cd929206e
font_01_sfnt_off000067c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C8 9252 bytes
SHA-256: 840325a138a53698dd740fb23359b0c8be16fe72c37ab8338a0aa994b66a44c9