Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22b664bbf06c5be…

MALICIOUS

PDF

34.3 KB Created: 2020-08-29 23:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15e2c6d460e6b9a289d6e77afc15b6da SHA-1: 89321b0f5f646435ed2517e38e8371c5b168d9f0 SHA-256: f22b664bbf06c5be4bda3b83ad2be9e8acab8558a9d5a815ba771e0cda0d2343
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 domain known for redirecting to malicious content. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector. This indicates a phishing attempt leveraging a link farm to distribute malware or lead users to malicious sites.

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=unnai+pol+oruvan+full+movie+720p+dow
    • https://static.usrfiles.com/ugd/b8c837_dd6b989234fb4b62b9efc3dbff31a08e.pdf
    • https://static.usrfiles.com/ugd/b8c837_ebaebab9db8e494c85fdf9b5bd3c9800.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf4dafc8180c4630bfbebbdf1f5301c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_0137f027e3e7450793abf5d066fa5ec1.pdf
    • https://static.usrfiles.com/ugd/0f5b72_ecba0547bdfe4fe68a203e1015ef4f77.pdf
    • https://static.usrfiles.com/ugd/ea2f88_dba0bb4ab61e4b6f98ecb8c8899d9ad2.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d0dcc6942254291ad08b1dd63b43c85.pdf
    • https://static.usrfiles.com/ugd/b8c837_62e7d0fc78bf44aeb11db80e0ba0244c.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/71110973057.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/tapal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2200/7969/files/september_2020_calendar_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/vizavemetujunesukup.pdf
    • https://static.usrfiles.com/ugd/a91264_b4a7e78220dc418ea0af370b6ce39cb2.pdf
    • https://static.usrfiles.com/ugd/ddb60a_7bf46419460c478c99ef92025932ba59.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d5abccfc9204656b8b2e684fdb2f274.pdf
    • https://static.usrfiles.com/ugd/b8c837_1120cf36c456447ea4535e950cd98174.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_off00004740.bin
1e45fc03ad01164274d80adcaa1a711ca4e06101348146372139c7c3764cc1a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x4740 5508 bytes
font_01_sfnt_off00005a08.bin
a67c9f9f610b03d55bc8ffc93031fa9e20dbad5015c44aedea4cd8e38f3d9988
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A08 10072 bytes