Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88636d7938d7d47…

MALICIOUS

PDF

42.4 KB Created: 2020-09-02 00:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ce50cbfc8a8c5e1d24623634210540 SHA-1: 503843dc03d69193f544ef4a9a59577ef921cffb SHA-256: b88636d7938d7d47268cc536cb2c26241bcbc39972946d77eadc0c01ecd18b6c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. This indicates a likely attempt to lure users to malicious sites, potentially for phishing or to download further malware.

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.ru/wix?keyword=linkedin+app+not+working+android+2018
    • https://static.usrfiles.com/ugd/b8c837_50ac7c30521a474289515246b2c668c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c68e448a9dff4b0caa2b20c150e57978.pdf
    • https://static.usrfiles.com/ugd/02beb7_a92649fd5c3e4def95e294a0e093dd7e.pdf
    • https://static.usrfiles.com/ugd/db93e9_6d163d884f9447ee8c8bb3cb2c338af5.pdf
    • https://static.usrfiles.com/ugd/50c35f_c21c9f26b1234ddebed10dbddb74fa9f.pdf
    • https://static.usrfiles.com/ugd/fbccce_7c8466d677534cecb65a404a1ff60109.pdf
    • https://static.usrfiles.com/ugd/de65f7_11247091e43e4a05b591711d28281ac2.pdf
    • https://static.usrfiles.com/ugd/b8c837_05e071803c274243bc1f846768ad98dc.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_6644d46f32a94eac9e96f4981a216644.pdf
    • https://static.usrfiles.com/ugd/10b11f_d5f6a3f6a0854c788cc4950e95401a88.pdf
    • https://static.usrfiles.com/ugd/895bef_02b02dcb01d04647912dc7eb6ac6766f.pdf
    • https://static.usrfiles.com/ugd/b8c837_abcc28a4d8af49968202b82dd3743905.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_off000065d0.bin
d15f378660c63708affecfbd5a34c68df27e4f609632da099ceb4919f7fcc4d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 5532 bytes
font_01_sfnt_off000078cf.bin
ac61e025a21326d5886e97add9552976c4e5c19752ed4fdb7e2a26c9f6333389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CF 10808 bytes

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