Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b56d10dc6acc39…

MALICIOUS

PDF

47.0 KB Created: 2020-07-09 08:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: c8d4a25219f55765c3ae18378859b903 SHA-1: ea2593dd51d8dfaee9cc57f47a8335b40a58a548 SHA-256: 03b56d10dc6acc395c96be31874d743d5bb95afbe674289feba43a5af2ea6264
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to various domains, indicating a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent, likely to redirect users to harmful content or phishing sites.

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.com/wb?keyword=personal%20effectiveness%20in%20gender%20communication%20pdf In PDF document text
    • http://files.dartendistrict.com/uploads/1/3/1/8/131856381/jarukid.pdfIn PDF document text
    • http://files.vmagchicago.com/uploads/1/3/1/6/131607010/patadefutugo-lobamanakad.pdfIn PDF document text
    • http://files.helptakeaction.com/uploads/1/3/2/6/132681938/3009213.pdfIn PDF document text
    • http://files.eugenemontgomery.com/uploads/1/3/1/4/131438766/zesolabugilobe.pdfIn PDF document text
    • http://files.lemonthistory.org/uploads/1/3/0/9/130969990/bumafu_gadurikuv.pdfIn PDF document text
    • http://files.fortsmithconcrete.com/uploads/1/3/2/7/132740547/8022016.pdfIn PDF document text
    • http://files.monfortestatesdacula.com/uploads/1/3/2/6/132681002/226bb98.pdfIn PDF document text
    • http://files.activewavesolutions.com/uploads/1/3/2/7/132741181/rigena.pdfIn PDF document text
    • http://files.gaindetalks.com/uploads/1/3/0/8/130874629/dojoja-kefuzegomoli-wadab.pdfIn PDF document text
    • http://files.traditionalmagic.com/uploads/1/3/0/9/130969758/jonapefori-bevikafoxitu.pdfIn PDF document text
    • http://files.theyogaschoolny.com/uploads/1/3/0/7/130775942/668541.pdfIn PDF document text
    • http://files.lhifranchise.com/uploads/1/3/1/6/131637092/riwus-ragosubevopi-zabemunavok-fumibebalodalaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://datewaxota.files.wordpress.com/2020/06/1263368535.pdfIn PDF document text
    • https://zejefasa.files.wordpress.com/2020/06/38193528888.pdfIn PDF document text
    • https://badodisorel.files.wordpress.com/2020/06/dugimegupuverikufevadexi.pdfIn PDF document text
    • https://jewufufa701292410.files.wordpress.com/2020/06/xugopatizan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47878122177.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.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_off000077fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FD 5420 bytes
SHA-256: b4d2be3b7d113008bd1a34ef269f7611bd600eb80e611f64409d7a348ef96654
font_01_sfnt_off00008a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4F 10520 bytes
SHA-256: 3c65475aad01b44c0bd38a3cc12e4ef52a1c5333787968dc0d2a8d324c3e481e