Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5db25bb722ad73…

MALICIOUS

PDF

47.7 KB Created: 2020-08-12 00:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c30ae91d4e818008061f59f51e6cf943 SHA-1: 33d993f5f880f5dd9a03b264278862d5a4312557 SHA-256: 5b5db25bb722ad73682fd769490406df182c9f89cbe033043d9b0eb092dd1086
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to a redirector service, suggesting an attempt to drive traffic to malicious sites. The document body, though heavily obfuscated, contains URLs that are part of a link farm, likely intended to deceive users into clicking through to potentially harmful content. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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/pify?keyword=fundamentals+of+python+2nd+edition+pdf
    • http://lipasajef.blueridgelanegermanshepherds.com/uploads/1/3/2/7/132712207/b34b329bde8ef.pdf
    • http://files.darbsterdog.com/uploads/1/3/1/4/131406722/624fa80ceb8c935.pdf
    • http://files.snowangelsiberians.com/uploads/1/3/1/8/131860060/jilosezivavozik_fobana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/gajuladoxaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/25869780113.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/26862209297.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/4090355038.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3074/files/80937808690.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/zudebupikasod.pdf
    • https://cdn.shopify.com/s/files/1/0434/0069/1868/files/niwewo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8702/7605/files/burojatakuwogikud.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/80753434168.pdf
    • https://cdn.shopify.com/s/files/1/0447/9369/2326/files/19455876417.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ea1.bin
eb7391119f8b0c881c4492b18798ae4f2573c41d7d6a3bf825cccb0f40b9b484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA1 5256 bytes
font_01_sfnt_off00008064.bin
8e10af21e6db36dbe73b13cde85490fc15d1ef59564c26cdd2e5503eabafbebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8064 10488 bytes
font_02_sfnt_off0000a417.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA417 4324 bytes

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