Malicious PDF — malware analysis report

Static analysis result for SHA-256 1039520d3a0fa9de…

MALICIOUS

PDF

58.9 KB Created: 2020-08-15 03:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f85f3ced5fd8a5564fe9043da637d86c SHA-1: 4a76a58bffaaf0c6487037b8f3caf2b3bab5436c SHA-256: 1039520d3a0fa9de6bc90ee57800cf6f733a9cd146717803097a34664625a432
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). The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of a link farm and a malicious redirector. While no scripts were extracted, the document's structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or phishing.

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=intracranial+hemorrhage+guidelines
    • http://files.a2shinrinyoku.com/uploads/1/3/1/4/131437554/1873326.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/7797/3654/files/seruwebo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/vawewegufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/popidujokagezokaruri.pdf
    • https://cdn.shopify.com/s/files/1/0431/8960/0414/files/53427279401.pdf
    • https://cdn.shopify.com/s/files/1/0430/8510/3258/files/gitut.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4573/files/wakekepebebuzixovoxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4381/4560/files/titazupemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2514/5754/files/widokadivizonazagofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7476/files/munam.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/ansys_manual_anna_university.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/acronis_true_image_2018_bootable_usb.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_off0000a9c5.bin
b0712617571ede19f7ac6615c6c98a532553d0505484cb34a25517893a463c08
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9C5 5288 bytes
font_01_sfnt_off0000bb82.bin
f97540af87bc6c5570529db6d43d25525f68de7bf9fd844d01939efbeae6ee63
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB82 10340 bytes