Malicious PDF — malware analysis report

Static analysis result for SHA-256 887d71f9650f0b61…

MALICIOUS

PDF

39.4 KB Created: 2020-08-03 11:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7507af179e9e8958ed8827a99417639f SHA-1: 00a09d239140c677c1e460e2077b3e2834a29831 SHA-256: 887d71f9650f0b61c00d1475d3003214324d5d133191d6847d15eec5b86220bd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector. The document body, though partially corrupted, contains text related to 'abbreviation worksheet for grade 3 pdf' and the authoring application 'wkhtmltopdf', indicating a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

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.ru/pify?keyword=abbreviation+worksheet+for+grade+3+pdf
    • http://files.labeventing.com/uploads/1/3/1/4/131406086/subunen.pdf
    • http://files.billings-equestrian.com/uploads/1/3/1/1/131163559/zujaba.pdf
    • http://files.sjspfaithformation.com/uploads/1/3/0/7/130739520/lituzodel.pdf
    • http://files.kenmoreta.org/uploads/1/3/0/8/130814132/fecec265b94.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/2887/9272/files/58875110054.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/rabubivozudikinowegikuwo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2215/3890/files/gimifulusezonaxejuworulo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/tipufo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/33608295818.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/80690145343.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/80062767579.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23582012054.pdf
    • https://cdn.shopify.com/s/files/1/0433/1231/6584/files/kalatudupuba.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/wosakexidisosugu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jibivugutujul.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/hosting_a_website_on_github.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_off00005ae7.bin
edbb88d45455331e4e331f82384592e261dddb4d21e39ac8da853eaea6982b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE7 5780 bytes
font_01_sfnt_off00006ea8.bin
c1990e7bf5ed899baac2c31220abe30caf98ef9fd8af5bba299866a21fdc8d57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA8 9976 bytes

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