Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df17dec28271af0…

MALICIOUS

PDF

49.9 KB Created: 2020-08-19 21:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02f39a6acc5ef76f119b8d21bb9f2993 SHA-1: 6962f0fb91b2f49ddd91574623bf309dcea674be SHA-256: 5df17dec28271af02c05b9368d8aff5391ef4bc68c752aa477347e9d27fbd673
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a link farm pointing to redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to phishing or malware distribution 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/pify?keyword=discussion+forum+template+php
    • http://files.makeupalchemist.com/uploads/1/3/1/4/131438113/xofowigewi.pdf
    • http://files.colombotourpackages.com/uploads/1/3/1/3/131380343/nowudoseninonogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6845/6088/files/gbc_emulator_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/exercices_articles_partitifs_fle.pdf
    • https://cdn.shopify.com/s/files/1/0439/3448/2587/files/nightbot_countdown_command.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/19984052184.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4985/files/doxokotosoziwebitubetetij.pdf
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/xekewufekedonasepapafuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/73248938605.pdf
    • https://cdn.shopify.com/s/files/1/0429/6091/2537/files/40818503423.pdf
    • https://cdn.shopify.com/s/files/1/0429/2801/3471/files/biology_research_articles.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/vufipepu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5656/1318/files/taguruzaridisovo.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_off00008a01.bin
2af219fe39b4295f8ef17a60f2f326e406ad95014bff673f34f25a95a3c8c387
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A01 5252 bytes
font_01_sfnt_off00009ba9.bin
75b4cfe6a534e9a0bf1142fcacdcff1a7ab2dc17d3199b4267bdcc72a0e719e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BA9 9192 bytes