Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dabb334e6f5a632…

MALICIOUS

PDF

34.3 KB Created: 2020-10-08 10:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df6d859cfa8c82e58bf4b77db72b3ee8 SHA-1: 330e28714372ee5409f6014f65490d3cd60ea07e SHA-256: 6dabb334e6f5a63218a396d50f286edfaf026097620a817f2e9eaa053a91507f
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate book downloads, but a critical heuristic identified a malicious redirector. This redirector ultimately points to a URL that likely serves a malicious payload, disguised as a PDF. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to exploit SEO for malicious distribution.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/pify?keyword=analytical+mechanics+fowles+7th+edition+pdf+free+download In PDF document text
    • http://jukebud.redeemernewton.com/uploads/1/3/2/6/132683008/paginowevugalap.pdfIn PDF document text
    • http://files.centralflhomeeducationservices.com/uploads/1/3/0/8/130813546/468097.pdfIn PDF document text
    • http://files.marizageorgalou.com/uploads/1/3/2/7/132712306/nirapifunek.pdfIn PDF document text
    • http://files.nanoquests.com/uploads/1/3/1/3/131383581/b44ea8980.pdfIn PDF document text
    • https://site-1042276.mozfiles.com/files/1042276/wexaduvufikebepuxigi.pdfIn PDF document text
    • https://site-1036796.mozfiles.com/files/1036796/59411768750.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5176/9247/files/ketogenic_diet_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/44221050701.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6624/4251/files/the_globalization_of_eating_disorders_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9854/0699/files/asu_career_services_downtown.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/5785/2828/files/80163454387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1078/7992/files/viferekezumimixo.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_off00004505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4505 5656 bytes
SHA-256: 304f4aaba58b6697a7d9b985c74378bdc2f3b01014298514307bed3f9a877ba7
font_01_sfnt_off00005840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5840 10560 bytes
SHA-256: 628614cc2e2eee6a3454bddaffb07c93c1ee94941e298fb7a91609facaacf712

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