Malicious PDF — malware analysis report

Static analysis result for SHA-256 680f32130120e553…

MALICIOUS

PDF

43.7 KB Created: 2020-10-15 01:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 38251d38156ba9f7d143ef8cbe215a22 SHA-1: e72e31dbebca56d0b207fa78d0bf2467181d1477 SHA-256: 680f32130120e553e6370a949be2a24aa15a8798140ba864b18203908605eb05
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract traffic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

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://gettraff.ru/123?keyword=bandmusic+pdf+library+inc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8777a8e4db9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f87485565b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87707a27f03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_5f876eaf8f1db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f876deb163ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8749feb7fe2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8769093addf.pdfIn PDF document text
    • https://site-1039002.mozfiles.com/files/1039002/34017204210.pdfIn PDF document text
    • https://site-1037024.mozfiles.com/files/1037024/zopug.pdfIn PDF document text
    • https://site-1038397.mozfiles.com/files/1038397/kewif.pdfIn PDF document text
    • https://site-1040264.mozfiles.com/files/1040264/74764545643.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/1/0490/6414/9168/files/undertale_undyne_fight_scratch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1456/6300/files/downloader_apk_forbidden.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4155/7150/files/integrated_math_3_course_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8563/9061/files/brother_vx-1120_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5853/0966/files/93548795336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4627/5752/files/burogalosamunamuzepoxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3454/2748/files/luvurojasexiliwapefoxe.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_off00006ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADE 5592 bytes
SHA-256: b10eca5199c2ad976e3b11d4630b0f25e4319aae6b82c23d82328bc8a367d560
font_01_sfnt_off00007dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC2 10460 bytes
SHA-256: e14e9a3ed9a33903a1055fe5b51089bf003e2a7438191b4b0a0898b444375380

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