Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b0a28f215d6117…

MALICIOUS

PDF

42.5 KB Created: 2020-08-01 22:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c22d7f34e8ff3e29d5eb6bcc99e4487 SHA-1: 36f87447c141a9fdc3b6f955cc8448844dd0ff1f SHA-256: 73b0a28f215d6117f0613f9436a1fc7afa72513d9966783e91a706f51973fd04
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting an attempt to lure users to malicious infrastructure. The presence of many Shopify links indicates a link farm strategy to obscure the true 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://ttraff.com/pify?keyword=force+and+destiny+core+rulebook+pdf
    • http://files.kolayoga.com/uploads/1/3/0/8/130813738/muligak_kegifip_fozifumupazawo_jisobasuga.pdf
    • http://files.jiniepku.com/uploads/1/3/1/4/131454090/binetos-xedifew.pdf
    • http://files.nnhst2.org/uploads/1/3/1/3/131380558/koxam_dutupiladal_zowozo_romiloxori.pdf
    • http://files.rebeccabelldressage.com/uploads/1/3/1/4/131453432/8443137.pdf
    • http://files.hapabq.org/uploads/1/3/1/4/131406258/posetigubofi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0577/1939/files/31182931550.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/revizabijoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10542261424.pdf
    • https://cdn.shopify.com/s/files/1/0428/4894/4284/files/libuputufevoleronumakeni.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/95250961327.pdf
    • https://cdn.shopify.com/s/files/1/0435/0846/5828/files/41631542211.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/86292288889.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/petapabaxur.pdf
    • https://cdn.shopify.com/s/files/1/0437/7349/3406/files/lonozax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6423/files/42707689499.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/nokajujusekopumatuganopa.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/motivanexasisakun.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_off00006697.bin
51d520b0ce2065a6ca5ca79716e6c38838a6c8bd5dd150ce3359354ce1fa8e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6697 5408 bytes
font_01_sfnt_off00007912.bin
b0967587a9509a1fc61c62f79c9e6106a05076dbc29bd7b92703b0c3ac056d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7912 10476 bytes

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