Malicious PDF — malware analysis report

Static analysis result for SHA-256 62dbd4d44151577c…

MALICIOUS

PDF

58.3 KB Created: 2020-11-05 18:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baeb2781109ead8fc7036d434f9f12e6 SHA-1: 937370d72ace53943bb724fdad5d1094e6158789 SHA-256: 62dbd4d44151577c1b02a4845f98938030e98ab7b5191c011ceb7928a34fba13
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO spam tactic. One prominent URL, 'https://traffset.ru/123?keyword=pampered+chef+cookie+press+gun', is embedded in the document body and appears to be a lure. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?keyword=pampered+chef+cookie+press+gun
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/davalebadebomizuz.pdf
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/afdea.pdf
    • https://rasuzumiketasak.weebly.com/uploads/1/3/4/3/134393825/acc025e79.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/665612.pdf
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/5128040.pdf
    • https://dujizozobalosu.weebly.com/uploads/1/3/4/4/134470010/494762.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remeranexe/xuvaninizigiso.pdf
    • https://s3.amazonaws.com/sinamozagemoger/69307530097.pdf
    • https://s3.amazonaws.com/felasorarabipis/87075613285.pdf
    • https://s3.amazonaws.com/henghuili-files2/70264572913.pdf
    • https://s3.amazonaws.com/muxozuvalubi/artigo_meio_ambiente_e_sustentabilidade.pdf
    • https://s3.amazonaws.com/vavapekadoliti/the_performance_appraisal_question_and_answer_book.pdf
    • https://cdn.shopify.com/s/files/1/0502/5552/8119/files/50754344383.pdf
    • https://s3.amazonaws.com/nozazodivin/mukunugekud.pdf
    • https://s3.amazonaws.com/juvuraguvutoxif/bodmas_worksheets_for_grade_6.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a415.bin
216423ee47a53c3af461b74781b6cad5adfeb39770900ecc1d3dd05709c21b50
pdf-font-stream PDF embedded font (sfnt) at offset 0xA415 5600 bytes
font_01_sfnt_off0000b6fa.bin
66b82eed38f9cda51c8911c3a177f1cf1946cbc2099b2aaa790e5f98814238d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FA 10912 bytes