Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb4df82da7b83a0…

MALICIOUS

PDF

35.8 KB Created: 2020-08-31 06:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dafff8cee371855a3e9f1d392df17ba6 SHA-1: cbf72eb22cd33c1d5b0292ca47553b17c54c584e SHA-256: beb4df82da7b83a0cf744bb682ab5466a448c99cf2b57e7ba0ae585d7374cc79
152 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body and a critical heuristic specifically mention "download wifi map apk", and the primary malicious URL is associated with this keyword. The file also exhibits characteristics of a link farm, suggesting a broad distribution attempt. No scripts were extracted, but the presence of malicious links is sufficient to indicate a phishing or malware delivery attempt.

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=download+wifi+map+apk
    • https://static.usrfiles.com/ugd/b8c837_c98c319dd3274486bdf28506ffc0fbdc.pdf
    • https://static.usrfiles.com/ugd/73f3b0_3f36458eefe942c382e3d8774174ec7a.pdf
    • https://static.usrfiles.com/ugd/95089d_c1e995d681b9434fb6930e53044301c4.pdf
    • https://static.usrfiles.com/ugd/9ec29b_43369e8b5bd845a0985b8340085380f3.pdf
    • https://static.usrfiles.com/ugd/e23fbb_239537b89ebb4876be327acc4a42b170.pdf
    • https://static.usrfiles.com/ugd/07625c_8cf2302bcf1e4eb695c71464d7d47317.pdf
    • https://static.usrfiles.com/ugd/b8c837_e410d01fb5eb4f5bae7a3678bc2012ba.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/administracion_de_empresas_basico.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/95827452352.pdf
    • https://static.usrfiles.com/ugd/0dd040_ba4dd5fd473e4ab588fbbb2747c22a86.pdf
    • https://static.usrfiles.com/ugd/d94ae5_4ff4d5791c1a411883bc2bc6040fdef0.pdf
    • https://static.usrfiles.com/ugd/4dd980_bea23464112d406d8f888ec689fe2f63.pdf
    • https://static.usrfiles.com/ugd/b8c837_762337e21b2b4b40bb75596da384d484.pdf
    • https://static.usrfiles.com/ugd/f63f29_847b94c179574cdb81b7876c3a9dcdf4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004716.bin
368159a6820862e2097b20e5114236ad9441a5237d620049014eccb4879ce59f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4716 5068 bytes
font_01_sfnt_off00005859.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5859 2140 bytes
font_02_sfnt_off00006230.bin
85eb208632d4fe26301bb2f9db2efaa3561b801a32532c6de75419177765b871		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6230 9464 bytes

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