Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6139aca90a2687…

MALICIOUS

PDF

35.2 KB Created: 2020-08-17 17:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24b90efebea7b24f281ca5d76e66f648 SHA-1: 5ed170ed9bde948dfc97823f3dbfcf6703fcc11f SHA-256: 7c6139aca90a2687a746aadf2120248a5bbbb978cd893973ed26a65129234f50
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body text, though garbled, includes a URL that appears to be a lure for "hammered metal sheets for sale", directing users to a known malicious redirector. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=hammered+metal+sheets+for+sale
    • http://files.tinablanck.com/uploads/1/3/0/7/130739744/luvebututipe-nokulemeku.pdf
    • http://talemi.ozonatrace.com/uploads/1/3/1/4/131483254/6039611.pdf
    • http://torozolu.prinevilleredemptionhouse.com/uploads/1/3/1/3/131398285/mogujufu-zisufoverakufez-gifada-mowimuxonidilu.pdf
    • http://files.caasfepconference2020.org/uploads/1/3/0/8/130813095/8387626.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/pool_games_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/kireketedumegudevogew.pdf
    • https://cdn.shopify.com/s/files/1/0431/8078/5821/files/togibadodukumazojawaned.pdf
    • https://cdn.shopify.com/s/files/1/0437/1673/9222/files/letter_of_resignation_from_teaching_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/9714/4990/files/tobusiduruwuxigodiludanu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/xafux.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0787/files/android_auto_honda_odyssey_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/1664/2975/files/97876344115.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30698029692.pdf
    • https://cdn.shopify.com/s/files/1/0437/5176/8225/files/81592603906.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/wanirupulilofuker.pdf
    • https://cdn.shopify.com/s/files/1/0430/9224/6685/files/azolla_in_rice_cultivation.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_off00004c1b.bin
5223f263cc95ab0f4e646693073bf616ab8dcab4938f1d38ca698bcf230781df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1B 5108 bytes
font_01_sfnt_off00005d52.bin
6a0e8d59a46cbb407bbf20dc4ce77d21f8ce153605b04a136347a9d0c469e054		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D52 10316 bytes

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