Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b228d5025226cd0…

MALICIOUS

PDF

43.8 KB Created: 2020-08-09 03:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccc41c82660a2d3858a3daab13679517 SHA-1: 72e5451a18266f1f6e6384f34428f96bea774b6e SHA-256: 0b228d5025226cd0347c261ad8041013a02c0c610f55ac19a7d786b9d94996a2
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains lures indicative of an advance-fee scam, presenting itself as a Tricare East prior authorization form. It embeds numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.cc/pify?keyword=tricare+east+prior+authorization+form+2020+pdf'. The document body also contains this URL, suggesting it's intended to be clicked. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/pify?keyword=tricare+east+prior+authorization+form+2020+pdf
    • http://files.mealprepdaily.com/uploads/1/3/1/0/131071043/3089382.pdf
    • http://files.3nchallenge.org/uploads/1/3/0/8/130874493/7523588.pdf
    • http://files.stjohnsfruitland.com/uploads/1/3/2/7/132710687/jibitodu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/57655415605.pdf
    • https://cdn.shopify.com/s/files/1/0433/5193/3078/files/industrial_automation_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/8005/5958/files/24143855673.pdf
    • https://cdn.shopify.com/s/files/1/0432/1381/5966/files/12559133435.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/16706908986.pdf
    • https://cdn.shopify.com/s/files/1/0432/6716/2276/files/85989075609.pdf
    • https://cdn.shopify.com/s/files/1/0434/5364/4966/files/mimanozutekotila.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/iodine_deficiency_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0429/8162/1919/files/57686950586.pdf
    • https://cdn.shopify.com/s/files/1/0440/6224/5029/files/bulk_density_of_aggregate_test.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/neet_pg_2020_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/42024037033.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/56561494036.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_off00006c26.bin
038b8390f8ecc23cd8d78c04c31d13780432b604de4bdc26949332b8c1632945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C26 5636 bytes
font_01_sfnt_off00007f2d.bin
082e75569a71d732d9616534617593e35d90200950835d25af80a3edf56302df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2D 10272 bytes

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