Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bc10033cc24444…

MALICIOUS

PDF

36.0 KB Created: 2020-08-22 04:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1c6bfdb1af1d59d2762e56476157fb4 SHA-1: 6cc89a87c79278030000e03ffc97137d87a323ab SHA-256: 61bc10033cc2444456d2ef6e500d88cdef202af4eee508f944acb4276d906080
154 Risk Score

Malware Insights

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

The PDF document contains embedded links designed to redirect users to malicious infrastructure, masquerading as educational content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=avancemos+2+workbook+answers+page+24, which is flagged as a known malicious redirector. The document also hosts a large number of benign-looking PDF links, likely for SEO manipulation, but the critical finding is the malicious redirector. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/pify?keyword=avancemos+2+workbook+answers+page+24
    • http://dosazefa.yumandgetit.com/uploads/1/3/0/7/130739046/gimipatexunusifatom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0443/4444/3036/files/list_of_antonyms_words.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5164/5093/files/digestion_of_carbohydrates_in_ruminants.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0957/files/42016741940.pdf
    • https://cdn.shopify.com/s/files/1/0449/7804/5086/files/17286156483.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/68272286652.pdf
    • https://cdn.shopify.com/s/files/1/0429/8273/6031/files/sistem_pencernaan_manusia_lengkap.pdf
    • https://cdn.shopify.com/s/files/1/0437/3151/7605/files/pukirubewolizejumix.pdf
    • https://cdn.shopify.com/s/files/1/0431/1082/6146/files/bible_books_and_authors.pdf
    • https://cdn.shopify.com/s/files/1/0430/7786/1527/files/intermediate_exam_date_sheet_2019_up_board.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/97652090331.pdf
    • https://cdn.shopify.com/s/files/1/0431/7983/5547/files/zutojatonegutigolokori.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_off000047d8.bin
91f1a21809fb453186cfa0225a67746ce80c60e0cff328273f2598787a573862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47D8 5784 bytes
font_01_sfnt_off00005b91.bin
5828a2c6f748408629fc94550ad3d0d3c71873bd14efb230f89eeb27190f9921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B91 12232 bytes

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