Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa5e5b915158092…

MALICIOUS

PDF

48.8 KB Created: 2020-08-22 08:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12f05a68720cd701a22b4bbf21c272e7 SHA-1: ef18ff0611df625ff3427c6ac0c8b7f51933ea2c SHA-256: 8aa5e5b91515809228faa7327ce5c5df3125380730ede4d3cee11b3eedb6a8fd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains embedded links that lead to a malicious redirector, disguised as interview questions. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, many pointing to Shopify, suggests a link farm used for SEO poisoning or distributing malicious content. The primary malicious IOC is the redirector URL.

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=biomedical+technician+interview+questions+pdf
    • http://kanezodu.ashraehrc.org/uploads/1/3/1/3/131384778/ketikukiz.pdf
    • http://files.spacepancake.com/uploads/1/3/1/6/131637316/muxaba_zuvuf_najeweligor.pdf
    • http://files.mahimashahverma.com/uploads/1/3/1/3/131379732/pepubidexeso.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4943/files/livro_ansiedade_augusto.pdf
    • https://cdn.shopify.com/s/files/1/0438/4918/7493/files/2303225003.pdf
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/96229535562.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/375705477.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/dowusozojefa.pdf
    • https://cdn.shopify.com/s/files/1/0436/5484/0485/files/subazowisogofipukewokapex.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/4772609242.pdf
    • https://cdn.shopify.com/s/files/1/0432/9252/4702/files/nopesexisovulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/26253788558.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007df5.bin
8f84cd57a5c1d18e04cba6004cc8bb17cf3cd5b450f9a598bf4f7fe9ca6d1ff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF5 5720 bytes
font_01_sfnt_off0000914d.bin
da4b1b4011fddd63f69c13601e0c06b2baf190e457a105a4bc63d3d941f138d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x914D 10772 bytes

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