Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66dad6db1d2ea8e…

MALICIOUS

PDF

44.4 KB Created: 2020-07-22 06:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26371dd53a160451b56144c123dd370a SHA-1: 3c714e99ea7f2edeaa405c43ed484ea6595405f9 SHA-256: f66dad6db1d2ea8ef164c64e7f0648a74f70d8c0fa129964b13950876423ac8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be related to educational material, suggesting a lure to disguise the 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/wb?keyword=rpp%20k13%20biologi%20sma%20kelas%20x%20pdf
    • http://files.goldencrossagservices.com/uploads/1/3/2/7/132740723/fiwizixek.pdf
    • http://files.truthillustrated.net/uploads/1/3/2/6/132695813/5f5709697909038.pdf
    • http://files.fittingroomligonier.com/uploads/1/3/0/8/130814672/sodumavasoso_sugenufefigu_tinivotosuna_sezomojodupebe.pdf
    • https://naruxodusuv.files
    • https://cdn.shopify.com/s/files/1/0440/2446/3525/files/21592467266.pdf
    • https://cdn.shopify.com/s/files/1/0432/9593/2584/files/86394297251.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/41716301418.pdf
    • https://wikanoxegi.files.wordpress.com/2020/07/19616168902.pdf
    • https://naruxodusuv.files.wordpress.com/2020/07/bagigixojefogavoz.pdf
    • https://bazebibirolo.files.wordpress.com/2020/07/buzisukojopifakukiniwiteb.pdf
    • https://panoxovijudo.files.wordpress.com/2020/06/lijepesetax.pdf
    • https://cdn.shopify.com/s/files/1/0435/6364/7131/files/11753087469.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/fajidelefezore.pdf
    • https://cdn.shopify.com/s/files/1/0433/0091/3310/files/lamowos.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/pimonozup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/basugogigarerebid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73807437975.pdf
    • https://cdn.shopify.com/s/files/1/0429/0733/6867/files/sukuf.pdf
    • https://cdn.shopify.com/s/files/1/0441/3403/9704/files/53633242181.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_off00006ae5.bin
7df6f07c517535c6467d0cd7941b9d3cb7eec600dc382368e6bdc5298c64aac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE5 5360 bytes
font_01_sfnt_off00007d30.bin
81114b29c09f6f5e55a8d2ff22b674fd876f07d6d5f66f6c4e006c2fca0c63ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D30 12244 bytes

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