Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f1420893a2c837…

MALICIOUS

PDF

36.9 KB Created: 2020-08-05 08:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c323fa3568f4d3a50ddf8ba2667743 SHA-1: 2623325656334c975cab183e4df8ccf2b6bd78bb SHA-256: e9f1420893a2c8371f60ef9f78f8427f9d8d9d58ec05f34302b8509aa6a1b4b1
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to seemingly unrelated PDF documents, designed to manipulate search engine rankings. One prominent link, https://ttraff.com/pify?keyword=holt+mcdougal+algebra+1+common+core+edition+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other Shopify-hosted PDFs, suggesting a lure to a malicious site disguised as educational content. The ML classifier strongly supports the malicious nature of this PDF.

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=holt+mcdougal+algebra+1+common+core+edition+pdf
    • http://files.lilypadplanet.com/uploads/1/3/0/7/130775645/furefevikivi.pdf
    • http://nadaz.vbmdallas.com/uploads/1/3/2/6/132682646/zokipufuwokefat.pdf
    • http://files.wellbeinglifeus.com/uploads/1/3/2/7/132710795/punofepetew.pdf
    • http://files.sagetribeart.com/uploads/1/3/0/7/130738622/wegadi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53607129813.pdf
    • https://cdn.shopify.com/s/files/1/0428/9377/0919/files/heat_and_mass_transfer_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/1321/8210/files/xaziporimiwenakuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/telangana_election_results_2020_constituency_wise.pdf
    • https://cdn.shopify.com/s/files/1/0433/1775/6057/files/bulox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4234/8949/files/67968547604.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/8867554339.pdf
    • https://cdn.shopify.com/s/files/1/0434/0373/9294/files/77823598996.pdf
    • https://cdn.shopify.com/s/files/1/0439/4608/2472/files/zofedub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/13457591102.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/vivezepobu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9535/7595/files/nuwaxuzisinejo.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_off000050a5.bin
905da90ba8159e20444faa1d5d77f71348987bf93e8c860030c605a2f8cefd05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50A5 5448 bytes
font_01_sfnt_off00006317.bin
093195c071d729806ed5646157dce583d339083d19fd5c7572659643bda0f29b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6317 10440 bytes

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