Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d4e3f0e369871e…

MALICIOUS

PDF

47.7 KB Created: 2020-10-27 13:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cd9366721bd1d05b104ba7ddd0db1aa5 SHA-1: edca1ebf16960ea5213454f43da5b7ab5a2b9c07 SHA-256: 59d4e3f0e369871e3dfe5fde3c4fa7042f706c8c11048eaa26fd7c79d1f0b271
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a title for an academic book, likely intended to deceive the user into clicking the malicious link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or SEO poisoning attempt.

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.cc/123?keyword=college+algebra+and+trigonometry+6th+edition In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5f93e5f17090e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5f92cc45860b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f97b6a7678eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373304/normal_5f89c0a412733.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/1/0482/9924/5723/files/name_change_after_marriage_checklist.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6439/3367/files/87765967322.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0146/1410/files/noxibijinutetilikufokebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/8432/5305/files/yamaha_mountain_max_700_triple_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9808/4006/files/kopizexasapamosome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3358/2998/files/monticello_minnesota_library_hours.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0589/2546/files/84270053737.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/saavn_pro_apk_download_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9979/1265/files/medicinal_uses_of_aloe_vera.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/alternative_dispute_resolution_festin.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/criminal_justice_system_in_nigeria.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_off00007ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB4 5360 bytes
SHA-256: c9010ff9eaf55ff39fc839ffd09a96f33d4361c62655f03c89ecb0b7fb88affb
font_01_sfnt_off00008cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC8 11096 bytes
SHA-256: 15154412f7cc3728e503b07ec105dfd64b897126217c877a7392f683d1b1f439

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