Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19a2c13cbdc256b…

MALICIOUS

PDF

43.8 KB Created: 2020-10-30 19:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: db37d16f1146bb6b248c88afb5beeee9 SHA-1: 9dd231642690f9e490c988010022a4da3ec96272 SHA-256: e19a2c13cbdc256b8dfb2c0f07ff7209a0371183b314335935ce04322b8f3278
184 Risk Score

Malware Insights

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

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 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://ttraff.club/123?keyword=five+nights+at+freddy%2527s+2+apk+full+version+mod In PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/7f6d29bff2a62.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/f1c98.pdfIn PDF document text
    • https://bufazori.weebly.com/uploads/1/3/4/3/134377245/zamajumewanin.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/95010c4d.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/ruxef_nugamuba.pdfIn PDF document text
    • https://jopizogado.weebly.com/uploads/1/3/4/3/134317888/0eadaf2e7287d2.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/bovem.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/d5cb2d48a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7051/8983/files/figazebafadarenagun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2297/4627/files/41548177431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4170/4104/files/biological_classification_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/rudram_namakam_telugu_free_download.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD0 5684 bytes
SHA-256: 5eb4cc19c3a767e709c6741e7a2eabe208be3626b5ea149695f9632f137b1383
font_01_sfnt_off00006f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F20 10828 bytes
SHA-256: aed6228646c47d45efc51a3244d0c1f4df29b7430bf22dc57e57cfcb16f9dd8f
font_02_sfnt_off00009426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9426 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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