Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e363f5bd337f50…

MALICIOUS

PDF

38.3 KB Created: 2020-08-14 18:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40450a72553db7f751d4dc7db71a0034 SHA-1: f810222d2b4d58d4a056ed6fcbed43c2619c9edc SHA-256: 16e363f5bd337f50e47e3d8d73cf23d9f19c1ed15d5e676ec0db58bbcf27ad16
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a movie search result, which is a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links, including a known malicious redirector, supports this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to lead the user to malicious content.

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.com/pify?keyword=sabrina+1995+full+movie+free
    • http://davig.zaialebtahi.com/uploads/1/3/1/3/131398109/nerubanugajogip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/12639143106.pdf
    • https://cdn.shopify.com/s/files/1/0435/0902/2886/files/79118496046.pdf
    • https://cdn.shopify.com/s/files/1/0433/4164/3928/files/7821988635.pdf
    • https://cdn.shopify.com/s/files/1/0433/8666/7158/files/jagakelixibuxofolobuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6195/3191/files/51700963129.pdf
    • https://cdn.shopify.com/s/files/1/0434/6281/9990/files/11831168040.pdf
    • https://cdn.shopify.com/s/files/1/0437/8771/4721/files/dupotifube.pdf
    • https://cdn.shopify.com/s/files/1/0432/4265/1816/files/rugomulufide.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/seismic_tomography.pdf
    • https://cdn.shopify.com/s/files/1/0431/6125/6096/files/xeniguxonovez.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_off00004f08.bin
4b34f0bae6c65d95e6919f9cf1a94b7d86f8947bec5d6075f6a70e319c572f58
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F08 5372 bytes
font_01_sfnt_off00006149.bin
c8a56cb9139cb1f031bf5ead4d215bdfaacdd63b9f42dfb0b6ddcbf91db58085
pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 13696 bytes