Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8852fa92c1efe3…

MALICIOUS

PDF

38.6 KB Created: 2020-09-13 04:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a06779e2c8b45f5d5bd673d59e27d120 SHA-1: 178d9b738993e5f21d2422c7c9e15b8f77b5c63d SHA-256: 7f8852fa92c1efe3c9cfacc70fd15a2eb4900f0601c998dcb7a6833ee0ed602f
154 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to a known malicious redirector, disguised as a stoichiometry worksheet. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate that the document is designed to drive traffic to malicious infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classification suggest a malicious intent to redirect users to potentially harmful 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.me/wix?keyword=stoichiometry+practice+worksheet+chemfiesta
    • http://kudaja.limoservicealbany.com/uploads/1/3/0/7/130738554/tewevugif.pdf
    • http://files.alton4chess.com/uploads/1/3/2/8/132815882/64c725bb9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/921909_b37615c583ac434bbb0dd58a117c3150.pdf
    • https://static.usrfiles.com/ugd/0a3240_0cb9697bbc764375a047325e4667599d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ba49b58ce7449a587958b952fcb2dcc.pdf
    • https://static.usrfiles.com/ugd/865d50_fc959d2e91f744cea1b51092e54bb4cd.pdf
    • https://static.usrfiles.com/ugd/2f3216_255ed80c9ef643d6b92aafe12af7582a.pdf
    • https://static.usrfiles.com/ugd/5899d5_8473abc536d942a4acc21a6f4027c134.pdf
    • https://static.usrfiles.com/ugd/fb5067_e1ab74ee29664dd5bad38c3ba0ca026c.pdf
    • https://static.usrfiles.com/ugd/b8c837_47e4f217def14a49a6bad2a3b6129161.pdf
    • https://static.usrfiles.com/ugd/1d3654_2c4b2d736c4d4b04bdda689dde242096.pdf
    • https://static.usrfiles.com/ugd/405339_4e96b09555af44dcacb857797e27d3f9.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_6b16bfe7629f4c52a27b4260d37b4e88.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_off00005859.bin
6948e13b67cfe15122117ff29f95e84212380d15e52ffe98e9a44f52689ba570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5859 5584 bytes
font_01_sfnt_off00006b4a.bin
c926bcdddf7fbf61761ac86a1586cfada987b2f98341de59990a39120c92e86d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4A 10060 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.