Malicious PDF — malware analysis report

Static analysis result for SHA-256 837dde19d6bf1ed1…

MALICIOUS

PDF

50.2 KB Created: 2020-07-31 08:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331096e2dc339e8f5120016d6664d26b SHA-1: 6a881d72a8d39674622b6f6af3e89c62d0db7072 SHA-256: 837dde19d6bf1ed118cb7ace95e90985e0f6c9bd06327b6640378013a25145f1
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc), suggesting an attempt to lead users to malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector and the overall structure indicate a phishing or redirection attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=winning+scholarship+essay+examples+pdf
    • http://files.rosedalehorseshow.com/uploads/1/3/2/6/132682681/varino-nonukededu-jobob.pdf
    • http://files.bendigowoundmanagement.com/uploads/1/3/1/8/131871477/607340c38b12f5.pdf
    • http://files.mertoncatholics.org.uk/uploads/1/3/0/8/130874296/lutup_xokolefivo_nomufovixok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4217/6150/files/futunikupumusugan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3817/8471/files/bumeko.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/79409065866.pdf
    • https://cdn.shopify.com/s/files/1/0433/3407/4523/files/vixadelu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/3024796901.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/zowutuxiziruro.pdf
    • https://cdn.shopify.com/s/files/1/0433/6133/7494/files/dukogegukogumini.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1080/files/lofabosolefod.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/niweduwedejovepelosof.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/28147258344.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8815/files/pekujonajugunagotitaxozug.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/gizakelawikexem.pdf
    • https://cdn.shopify.com/s/files/1/0428/0804/9830/files/xisegogawuponateno.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008569.bin
c1eaf78ea6903c051da0b64dde02a6530558b13e5b84a91cee409f4133b37bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8569 5460 bytes
font_01_sfnt_off000097d8.bin
10d28e9667d1cc84c9911dd2e1c6e652c059888af28a2c92b8d93b70cc34e356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97D8 10440 bytes

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