Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecb76101d104b23…

MALICIOUS

PDF

40.0 KB Created: 2020-11-01 08:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8e8f67a684f1cc32bdaf9ae5223c87fe SHA-1: e625505aee40a0e54c2877381e7dcc5aef5a8a1e SHA-256: 7ecb76101d104b239632a09c582bcdcf61a714eabdee559e55960919c41d4b9c
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector, pointing to `https://cctraff.ru/aws?keyword=eharmony+case+study+strategy`. The document body, though heavily obfuscated, contains this URL and other links, suggesting an attempt to disguise malicious activity as a case study. The presence of numerous external links, many pointing to benign Shopify PDFs, is characteristic of SEO poisoning or link farm tactics to obscure the malicious destination.

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://cctraff.ru/aws?keyword=eharmony+case+study+strategy In PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/1735007.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/noterufuwuxavo.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/1/0492/3018/4601/files/med_surg_nursing_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8373/4431/files/15838584488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/4235/5365/files/molina_healthcare_billing_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6089/4104/files/12419802098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0720/0408/files/spiral_buffet_manila_reservation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b08da2-0dab-4ed1-9f14-973cc6a44674/47458260274.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/32875889221.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0301/8918/files/android_get_application_context_from_static_method.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/8142/2766/files/18858606294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0185/5646/files/somabek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c97ca771-ed70-4f8a-9650-c96f8a2cd9e1/matisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a846352c-9456-439e-a5de-f6a123e365aa/86581069022.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_off00005f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7A 5380 bytes
SHA-256: ab5ac5cf45008d95fdd3230598b59f3907502d35d6d5769a020aeeda5109a199
font_01_sfnt_off000071a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A3 9896 bytes
SHA-256: 4cacc801ec3bf490bb965a32a76529c7ab79d03dcbb643f39a8d2d7a5fe37633

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