Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d574cd409ae2cee…

MALICIOUS

PDF

47.1 KB Created: 2020-11-09 15:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ac2542b7bc4ef8d23819a410efae974c SHA-1: bba98e499127f972fd17009be95f81dbb90d3ede SHA-256: 8d574cd409ae2cee07640bed350bee4644adbc8b1eddc0bf6cfeae0d7e7db8fc
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to suspicious or unknown domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a redirector link farm. While no scripts were explicitly extracted, the nature of the embedded links and the document's structure suggest an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/aws?keyword=apush+historical+thinking+skills+worksheet In PDF document text
    • https://lurakowufo.weebly.com/uploads/1/3/4/4/134457973/ec9b25b5a9347.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/xunoxekexokeg.pdfIn PDF document text
    • https://jevalibiku.weebly.com/uploads/1/3/4/2/134266190/raxudikifurim_wijanis_zofarazomuviki.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/6166323.pdfIn PDF document text
    • https://ribifafugulif.weebly.com/uploads/1/3/4/6/134650062/vidak-fejudulikofab-nafobu.pdfIn PDF document text
    • https://raminatu.weebly.com/uploads/1/3/4/5/134579417/tirofata.pdfIn PDF document text
    • https://zuwisikap.weebly.com/uploads/1/3/4/4/134441997/4657442.pdfIn PDF document text
    • https://fulugive.weebly.com/uploads/1/3/0/8/130874350/xoboderidizozimiso.pdfIn PDF document text
    • https://lopuzidijunusi.weebly.com/uploads/1/3/4/3/134378181/3465947.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/gojewaxuwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zesotat/48727226727.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/marvel_vs_street_fighter_apkmonk.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/blu_ray_shelf_walmart.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_off0000668c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668C 5340 bytes
SHA-256: cb033dab432fc731325c03652019b70ede31204f7f23af753f66d2b55eed8403
font_01_sfnt_off000078c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C1 9868 bytes
SHA-256: e76cf6e6a12dd2db5a717764047ee365f0a637ac415fa972b840b1df1caa7161
font_02_sfnt_off00009aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AAF 16060 bytes
SHA-256: 313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c

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