Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f83534b63216bdb…

MALICIOUS

PDF

38.4 KB Created: 2020-09-20 04:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b2576c54e559d05af343f57df0bc4725 SHA-1: b0962874514ba897db12100a4ebccb9aa758e906 SHA-256: 3f83534b63216bdb1527cbb74b74486f18f2ce8966e7510e7263b0c3be174713
184 Risk Score

Malware Insights

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

This PDF document contains a link farm designed to redirect users to various external resources, including a suspicious URL associated with 'netspend sb.com activate'. The presence of multiple links on disposable hosting and a known malicious redirector indicates a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to leverage user interaction for malicious purposes.

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/wix?keyword=netspend+sb.com+activate In PDF document text
    • http://files.fountainheadrandm.com/uploads/1/3/1/3/131378953/a202df6.pdfIn PDF document text
    • http://nubopa.windhofcareers.com/uploads/1/3/0/7/130739663/kigodaji.pdfIn PDF document text
    • http://lazebufod.allmetalcornerguards.com/uploads/1/3/2/7/132740564/xulazadepelikoz_witufigamuwumes.pdfIn PDF document text
    • http://jubobokis.towingstamford.com/uploads/1/3/2/3/132302963/42527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://955a0de5-3ba9-4edc-aacf-6e29760e33b9.filesusr.com/ugd/98d33d_94290124bf9d4297961561010acc7421.pdf?index=trueIn PDF document text
    • https://7b957fce-72e3-421a-a014-39a2270b63c6.filesusr.com/ugd/440e29_bbd14387cbfd4ca2a9986b44b6716c45.pdf?index=trueIn PDF document text
    • https://af3657f5-364d-4ccd-abcd-7a473b9cc02e.filesusr.com/ugd/ffcbea_4e83faa311af4cb78d2bd5ff5ae3f7e2.pdf?index=trueIn PDF document text
    • https://e83d2895-40e7-4c65-8d23-f61f96ea2d1f.filesusr.com/ugd/8dde66_d0e3b73476f74530a734c6cb01774890.pdf?index=trueIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2583/1835/files/jivufavipilemanikomapow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8393/8457/files/nisemaxajoruguduzasa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/3592704363.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5517/7109/files/84482862574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3565/5335/files/endosymbiosis_theory_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/luvevesod.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56D0 5292 bytes
SHA-256: 665345cd2cf1afb5fde71334aa74b98c693b368df0e31a942015f7836ce0b019
font_01_sfnt_off000068cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68CC 10812 bytes
SHA-256: cb337a5e2739ad53bdebe4b8090ae9db93623917c308e76442641eceb8127a95

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