Malicious PDF — malware analysis report

Static analysis result for SHA-256 992bee7e74d94cee…

MALICIOUS

PDF

47.1 KB Created: 2020-08-31 08:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26c137b67d09be522ba444b0f381349d SHA-1: 0a59d3607f03dd52f2c2a340d704f28524ceab27 SHA-256: 992bee7e74d94ceeb68e83ccc4a53f45a1a880033b643b8a3862e3683bccb79d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the target URL and appears to be a lure. The PDF also hosts a large number of external links, suggesting a link farm or SEO poisoning tactic.

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/wix?keyword=the+green+mamba+by+roald+dahl
    • https://static.usrfiles.com/ugd/88a84f_69f6827ca4c745529d4ea14c784b0a18.pdf
    • https://static.usrfiles.com/ugd/a771bd_2786335d53e54de4b917eaedfc902866.pdf
    • https://static.usrfiles.com/ugd/b8c837_681d5d5fb3eb4682a5c791d1f1f60db0.pdf
    • https://static.usrfiles.com/ugd/b8c837_93b387b90d8041d1806cdeb586303db4.pdf
    • https://cdn.shopify.com/s/files/1/0431/4811/6119/files/vaned.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/93889338404.pdf
    • https://cdn.shopify.com/s/files/1/0431/0922/0503/files/mavukaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/8344/7966/files/20045201412.pdf
    • https://static.usrfiles.com/ugd/b8c837_df0594bf9dcc475f9739fd2f7802f66a.pdf
    • https://static.usrfiles.com/ugd/5de1df_2275a9724ca040089be5d5fc3f7f44e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8405a7a87514521a8b6e3a1fa891439.pdf
    • https://static.usrfiles.com/ugd/b5aed9_a5136556dd8a4bbe8fd74d205d169680.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_0e2f89b070204dc9a0447447283f0363.pdf
    • https://static.usrfiles.com/ugd/5be868_4bbfadf7f72a40628941ab74471de53c.pdf
    • https://static.usrfiles.com/ugd/fa6f14_71a3fc48bffe49f18f6231b117823b84.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd0c15b13944d3c8c0a7ccd19bb429c.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b55.bin
bd3c443e813736fc6eb8ba4d7935f236e44d51c358fd58da219833f3d2465cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B55 5252 bytes
font_01_sfnt_off00008d06.bin
a71903e262f3dd234b48799ab393899bc3e768c377291d773ad74f23e132b57f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D06 10152 bytes