Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef115d373fdf3db…

MALICIOUS

PDF

55.1 KB Created: 2020-08-07 20:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce388f1f3a28f11a246bac873815117c SHA-1: a1d0b6171c703cf4f962f911d657808434348d64 SHA-256: 5ef115d373fdf3dbcb76f4ee040393846c13707d99e2977909c62a591f3fbb1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the malicious URL and appears to be generated by wkhtmltopdf, suggesting an attempt to manipulate search engine results or lure users to malicious sites. The ML classifier strongly indicates malicious intent.

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=partition+piano+amelie+poulain+comptine+d+un+autre+%25C3%25A9t%25C3%25A9+pdf
    • http://files.larryssportsexchange.com/uploads/1/3/0/8/130874128/folerezome.pdf
    • http://files.busylilbeefloral.com/uploads/1/3/0/7/130775249/f9e42a6650dfb7b.pdf
    • http://files.saraayllon.eu/uploads/1/3/1/3/131380627/vuserebolitis.pdf
    • http://files.tkcreations101.com/uploads/1/3/1/4/131437755/9268618.pdf
    • http://files.mycolorpainting.com/uploads/1/3/0/8/130814594/dadobof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6291/1391/files/zavedolaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/grant_cardone_closers_survival_guide_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/famafip.pdf
    • https://cdn.shopify.com/s/files/1/0437/2532/4439/files/cypher_x_hub.pdf
    • https://cdn.shopify.com/s/files/1/0436/9121/2950/files/69151550842.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0392/files/vojowidesegumekeko.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/96025705735.pdf
    • https://cdn.shopify.com/s/files/1/0438/0111/6833/files/zepilubanidunipijizu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/46588159687.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/falapuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5215/files/james_stewart_calculus_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/6271/4780/files/mesotelioma_peritoneal_maligno.pdf
    • https://cdn.shopify.com/s/files/1/0428/6572/1503/files/14477937350.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.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_off00008c02.bin
e96bbd7dc970d8dcafdf491e0c252ef36abbdf938c7b97b9e66e77c5ad08cee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C02 5264 bytes
font_01_sfnt_off00009d8d.bin
461aced2e04198d7ea676c14cf4eaec4f239af8809e0387ee7a18f4737ec63a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8D 15088 bytes

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