Malicious PDF — malware analysis report

Static analysis result for SHA-256 054c928a972bf65c…

MALICIOUS

PDF

40.0 KB Created: 2020-08-12 07:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21100cc45b5f1ee4eded4fed9bcba1b9 SHA-1: 8678b74ca6b6a97d1f4b6f7708a5592d2a6c6ab0 SHA-256: 054c928a972bf65c90de3bbddf4b4a31d879644673e8342513980bb7ae3aa9d1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting an attempt to lead the user to a malicious site. No scripts were extracted, but the presence of many links points towards a phishing or content-scraping 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.com/pify?keyword=5+point+likert+scale+template+pdf
    • http://files.pros2gogolf.com/uploads/1/3/1/6/131637714/zowimagebunukevete.pdf
    • http://files.follidaygallery.com/uploads/1/3/1/4/131482962/bifotoxozavoza.pdf
    • http://files.rsdouglasrealty.com/uploads/1/3/0/9/130969085/4563199.pdf
    • http://files.riballet.com/uploads/1/3/2/6/132695636/zosemozak-joxogimojetemud-jagotuxuwuxusos-bupixe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6820/9814/files/phases_of_meiosis_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/28148062701.pdf
    • https://cdn.shopify.com/s/files/1/0434/5482/4598/files/cae_exam_practice_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4104/files/64909119394.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/101_anti_aging_foods.pdf
    • https://cdn.shopify.com/s/files/1/0434/1560/1314/files/15093873965.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3320/files/suposetuxe.pdf
    • https://cdn.shopify.com/s/files/1/0446/9764/9306/files/what_time_is_afternoon_and_evening.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/devedipukutoxuxefilage.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6962/files/23812458281.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/kofotapi.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_off00006043.bin
1b7cc36ad34db5b923b57839ddc59ad9a65077b505a6840662c5b934d27028ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6043 5396 bytes
font_01_sfnt_off0000727d.bin
f2ac801a53c381b33dcc8c2e0494a33daf6658d7438e071849add9daceaacbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x727D 9620 bytes

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