Malicious PDF — malware analysis report

Static analysis result for SHA-256 64e08f3d19e356a1…

MALICIOUS

PDF

48.7 KB Created: 2020-08-10 11:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b4a71c9d25ef02bfb26766007e96a43 SHA-1: b4d342601067fe9cdb5cec905816f692616ade6b SHA-256: 64e08f3d19e356a1e908c5f06b50ebaf3a1f622deab571baa029286a8a929846
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO poisoning or to distribute further malicious content. While no scripts were extracted, the embedded links themselves serve as the primary attack vector, aiming to lure users to malicious sites.

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=escala+cromatica+teclado+pdf
    • http://files.ncbdfcs.org/uploads/1/3/1/4/131453645/c8688545988b58.pdf
    • http://liwiwuli.gandjstarkey.co.uk/uploads/1/3/0/7/130738524/9640572.pdf
    • http://files.bronzedoklahoma.com/uploads/1/3/1/8/131871704/minulogise.pdf
    • http://files.arbmic.org/uploads/1/3/1/4/131452799/rekevelozuferofel.pdf
    • http://files.theallyouneedtoknow.com/uploads/1/3/0/7/130739621/jamebak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/78549424270.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/73307855820.pdf
    • https://cdn.shopify.com/s/files/1/0435/8730/5629/files/24961266681.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rojifibopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/35174609691.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7095/files/zisikar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/70567673544.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/72488336202.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/wazixuvade.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1931/files/lojorimiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9515/4070/files/xuvogaxudimip.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_off000078e1.bin
9032cd4d4967768d783f0f654b1eb3e1f7a46b37bbf2bdd555d3f91edf173b29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E1 5256 bytes
font_01_sfnt_off00008aae.bin
c3cd7eac101ba9268833547b73e03ff9c813e801dcd538c9cf4e24c40f0756a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAE 12744 bytes

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