Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf20c9daace3d22…

MALICIOUS

PDF

52.9 KB Created: 2020-08-12 13:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16323aa3da8ce16c5e1e6c2a854a94b8 SHA-1: cbcd5d5b925d5ac35b317c8935e5532d190d9f5d SHA-256: fdf20c9daace3d225cfe6c7f8da8ca3d82e51fbe42271eb7a9d54533b87cbc5d
152 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the string 'All animal photo pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF also hosts a large number of external links, many hosted on Shopify, which is characteristic of SEO-based link farms used to distribute malicious content.

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=all+animal+photo+pdf
    • http://mupozi.nerrisnassiri.com/uploads/1/3/1/3/131380429/072d4f10901.pdf
    • http://files.kphtheatreproductions.com/uploads/1/3/1/8/131856158/fituzegosonoj-jusinuwidiwo-vakulewar-dunos.pdf
    • http://files.sanfrancisco-interactivehypnotherapy.com/uploads/1/3/2/6/132681863/bc2dbbadc.pdf
    • http://pewup.luckylaxstringing.com/uploads/1/3/0/8/130874474/c4342.pdf
    • http://lukitogo.mickkleijwegt.com/uploads/1/3/1/0/131070792/7d221b5f.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/keditopobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lekefokatonerosabiwifeva.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2593/files/free_brazzers_login.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7345/files/xidikagirejakakinewu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/39957966992.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/wulapukaravabo.pdf
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/81463456194.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7202/files/86224788378.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90278046640.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/55267536834.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/nisutul.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_off0000925d.bin
be89b4ef21a76e1a030200f950542df5618c396e26c90cfd460af96d5c0a34bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925D 4996 bytes
font_01_sfnt_off0000a333.bin
638b62746e1448d64532565f17b5bd860786eb2157494b65e1962408fb2d236b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA333 10260 bytes

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