Malicious PDF — malware analysis report

Static analysis result for SHA-256 8729119be5bd94f7…

MALICIOUS

PDF

43.4 KB Created: 2020-07-08 21:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 20f407acd4e069b2485fef5c3152c058 SHA-1: 6acc467cc1043b5b2ebaac0a2ecf2f7a07235ac6 SHA-256: 8729119be5bd94f7da0617bb21384132a676909b0dd57a9df3c5aa108300d554
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The document body, though obfuscated, contains text related to '11th class biology textbook pdf' and includes the malicious redirector URL. This suggests a link farm or phishing lure designed to drive traffic to malicious infrastructure.

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.cc/wb?keyword=11th%20class%20biology%20textbook%20pdf In PDF document text
    • http://files.metalmeltdown.com/uploads/1/3/0/7/130775755/36f932b68a.pdfIn PDF document text
    • http://files.all4pawsdogrescue.com.au/uploads/1/3/1/4/131455883/9425829.pdfIn PDF document text
    • http://files.carindalewritersgroup.org/uploads/1/3/1/8/131856844/7743649.pdfIn PDF document text
    • http://files.rocadog.com/uploads/1/3/0/8/130873895/7101740.pdfIn PDF document text
    • http://files.manyanabeachpad.com/uploads/1/3/2/6/132681316/f4916.pdfIn PDF document text
    • http://files.jazikatxox.com/uploads/1/3/2/6/132681450/50e5d51894.pdfIn PDF document text
    • http://files.teammissionsports.com/uploads/1/3/0/8/130873830/56fd778fc49d11.pdfIn PDF document text
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdfIn PDF document text
    • http://files.theriftny.com/uploads/1/3/1/4/131438840/fudiwideguj_lupebupirozebub.pdfIn PDF document text
    • http://files.michaelbrownslawoffice.com/uploads/1/3/1/4/131406762/xajixolaxexojobegu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xupafib.files.wordpress.com/2020/06/tuxezonuvivexebipure.pdfIn PDF document text
    • https://fabakimuli.files.wordpress.com/2020/06/43898814010.pdfIn PDF document text
    • https://xalebaxiberu.files.wordpress.com/2020/06/14820804149.pdfIn PDF document text
    • https://rejutunav.files.wordpress.com/2020/06/6737236974.pdfIn PDF document text
    • https://sivedup.files.wordpress.com/2020/06/25285511865.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/befuxaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61066914906.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B3F 5336 bytes
SHA-256: 8edf98356357f39869b7042ec2454f51cf63f0b24f9b8ec518dd166663ace718
font_01_sfnt_off00007d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7B 10420 bytes
SHA-256: c123555f8d1b81c5a052315ddac4c834827f1a733aed39a074e9a5b851d34254

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