Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bedfd6e58fea95b…

MALICIOUS

PDF

45.5 KB Created: 2020-08-14 12:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3538250c9655936e4a94d7689f882b3 SHA-1: 4abef30424dc5cf234c7b6238c42d6004e17af63 SHA-256: 5bedfd6e58fea95b59ed8bc8720feb212ea8985a3a32c6906fb16469b3fb969e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure. The presence of a 'download button' heuristic and the document body containing a keyword related to hacks suggests a lure to download malicious content. The ML classifier strongly flagged this PDF as malicious.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=anti+knockback+hack++1.+8
    • http://files.sarahobrienhart.com/uploads/1/3/2/6/132683142/bewowune.pdf
    • http://files.thoughtandprogress.com/uploads/1/3/0/7/130776327/mizubikut-vifoves-ligajerinu.pdf
    • http://difobed.4lifecapital.com/uploads/1/3/2/7/132710507/2af1fd5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/jogegi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0421/files/tekerijuluxojonenugo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0427/files/15979718839.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/58652944998.pdf
    • https://cdn.shopify.com/s/files/1/0437/5982/9149/files/xopovu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1796/9570/files/5740010965.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/wumotavo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1221/7241/files/88153551606.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/gekamamuderegomeporuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/6489/2323/files/suzizupedisevokozologewi.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_off00007597.bin
6486fca40651fead5ac1e98c0ce5dc5cd429e87a12c9755b8c3876ee6542cd18
pdf-font-stream PDF embedded font (sfnt) at offset 0x7597 5052 bytes
font_01_sfnt_off000086ce.bin
e3868a0854f70e669667ee75e3f89b810a6244be46b620afb0ce4f3d8d511053
pdf-font-stream PDF embedded font (sfnt) at offset 0x86CE 10192 bytes