Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b88cb4f341b06fb…

MALICIOUS

PDF

64.1 KB Created: 2020-08-30 03:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8aa4b95343ff0fdac2e93e01d0c1d3b SHA-1: 55541ca33661eb209bc2949daef1bd7e93490941 SHA-256: 9b88cb4f341b06fbc0ad8394668b9faaf708969f2ddb7712a1b3c1df0ec1ee57
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links, many of which point to a link farm. One of the primary links, 'https://ttraff.me/wix?keyword=cinema+baixo+as+estrelas+durango', is associated with known malicious redirector infrastructure. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its specific lure, but the overall structure strongly suggests a malicious redirection 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.me/wix?keyword=cinema+baixo+as+estrelas+durango
    • https://static.usrfiles.com/ugd/4ae4db_79fa64374f76481bba19c59268309cc9.pdf
    • https://static.usrfiles.com/ugd/9e53d4_944e2a36cdcf4bcc9705d969cb6cb4b0.pdf
    • https://static.usrfiles.com/ugd/b11f6d_27658c80102e43cea722eed829fda0d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_869ac493c09145dba22f0521491ed8c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_a2ed33a746e141df92f4cf37ceee8fc8.pdf
    • https://static.usrfiles.com/ugd/97368a_88255b38fc094aaf8ee87a5004951abd.pdf
    • https://static.usrfiles.com/ugd/ca300b_51628357310b473a843b01e5cab7c4e9.pdf
    • https://static.usrfiles.com/ugd/eaf48f_4e28a73a731949f78ff9cfdd808e3dfb.pdf
    • https://static.usrfiles.com/ugd/374ce0_5f38027953e44364af9aac344ef95625.pdf
    • https://static.usrfiles.com/ugd/affaa6_f68fc79f850b4c028fafc137b2cb7b04.pdf
    • https://static.usrfiles.com/ugd/e2c250_3485eac5fa104968bc20b952f54ed02d.pdf
    • https://static.usrfiles.com/ugd/eed56f_f8e33bd4cdb649a4844df87fa5216965.pdf
    • https://cdn.shopify.com/s/files/1/0432/9934/0448/files/aplicativo_para_baixar_musica_android.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/58594911086.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_off0000bebd.bin
e47adc66cbaee140f439a43a322e6126f45683dbd40de3d908e28a5e4c86e8af
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBD 5260 bytes
font_01_sfnt_off0000d073.bin
cf89613031e547450a18a6a8aa8715b180b5f8da5ddb81744ecf9f11423b60a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 10120 bytes