Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3be7024f1d525d…

MALICIOUS

PDF

45.9 KB Created: 2020-11-01 19:39:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9ddde3c90610dd562eb4aa693c7a407f SHA-1: d215137fda9acfbf04649ab170377612433cadce SHA-256: fb3be7024f1d525d0b72491fecde43eff49a5d429248bf06ffafddda86b0d1c7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=it+chapter+2+free+online+123movies In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_5f927b8e90c19.pdfIn PDF document text
    • https://pomitowu.weebly.com/uploads/1/3/4/3/134389192/6920981.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5f9ea327c4aa8.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/tijapiwevup.pdfIn PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/gufawoj.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/1866445.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5f88de2758e2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0053/0597/files/9680216163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a264f9-13e4-425a-bd3d-0a78f89410b6/vezojomebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7505453f-3da8-4d1e-b81a-8c294367eae3/10354684091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0435/1428/files/battery_operated_chandelier_outdoor.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C64 5600 bytes
SHA-256: c3e63df4372fae26b63c8296f3198c87e5144848c872e53cb71a87fdf9016e37
font_01_sfnt_off00006f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 10952 bytes
SHA-256: 0afa00a26618c22faef496ae5011fabd936a598f7fb9ead9130b15c2021f725d
font_02_sfnt_off000094d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D8 16312 bytes
SHA-256: 64898de6bd82f51caeb7f0a808de81f4edddb03b80b60cc7383c7c164704d284

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