Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f56b9672b21b08…

MALICIOUS

PDF

54.1 KB Created: 2020-09-05 20:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e393a7f1694e163cc5dba45cdc5b62f SHA-1: b2f7072510e3727a9b633d4f161071ddf658ef18 SHA-256: 17f56b9672b21b08df1bbf73bd14f743d6de842adbcd7ae11e439c27635c3f58
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains text related to medical guidelines and the redirector URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links further supports a malicious intent, likely for phishing or malware delivery.

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.link/wix?keyword=ispad+diabetic+ketoacidosis+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/dfb5f8_4724e772b0054d83a8b760be0b0cb272.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_2dfbcd42f88447e9a8b8f4f8c3f0fc9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_acf7e84155ca4fe594712a62d09d1253.pdf
    • https://cdn.shopify.com/s/files/1/0431/1669/1612/files/chappelle_show_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/16066233316.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuxekenosagulowagegur.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3834/files/16069248802.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/xezokefewelalumar.pdf
    • https://cdn.shopify.com/s/files/1/0435/8874/7423/files/0151_que_banco_es.pdf
    • https://cdn.shopify.com/s/files/1/0433/0523/8692/files/gisolupotanonugusijobufib.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/cause_effect_essay_sample.pdf
    • https://cdn.shopify.com/s/files/1/0432/8652/8155/files/epidemiologia_diabetes_mexico.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095bd.bin
7ab601a9ebbc05db62d6c42783c630fee8ea555e2499f8dc2d674dd76f73bf11
pdf-font-stream PDF embedded font (sfnt) at offset 0x95BD 5284 bytes
font_01_sfnt_off0000a7c8.bin
ccb89eeaac5526c0c7a60eafd4bca6a732e16537df89f699eaa086eda3c39384
pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C8 10368 bytes