Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebecbd34c4b7c0d1…

MALICIOUS

PDF

47.7 KB Created: 2020-08-14 10:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4f49fa763554af70189387e351a4f8b SHA-1: cf2ab76cef992ecd09ea598722e94b8c9369293f SHA-256: ebecbd34c4b7c0d18dbe366e7a48f7d966669e416c473e7f8d2aca25bd2c7cbd
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to benign Shopify URLs but ultimately leading to a malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to 'cladogram analysis worksheet pdf answers' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=cladogram%20analysis%20worksheet%20pdf%20answers
    • http://files.resourceology360.com/uploads/1/3/1/8/131858661/665f51d.pdf
    • http://files.prwmassage.com/uploads/1/3/0/7/130739758/3594519.pdf
    • http://sitejal.nurtureandnature.org/uploads/1/3/2/7/132712615/lowedex.pdf
    • http://files.evlr.co.uk/uploads/1/3/0/9/130969505/d345420a98c58b.pdf
    • http://files.ummahcharms.com/uploads/1/3/0/8/130874035/7459399.pdf
    • https://cdn.shopify.com/s/files/1/0437/1929/5130/files/benibepaniwa.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/allahabad_high_court_aro_result.pdf
    • https://cdn.shopify.com/s/files/1/0433/9616/9886/files/gebibaxokamatozibufazul.pdf
    • https://cdn.shopify.com/s/files/1/0438/4981/0080/files/renokidisiretiweji.pdf
    • https://cdn.shopify.com/s/files/1/0434/8071/1325/files/kegodo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5478/files/lepomatagazusugepozuri.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/27765440668.pdf
    • https://cdn.shopify.com/s/files/1/0447/4516/2903/files/lexus_is250_repair_manual_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/8770/6774/files/safazovotariparidi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0427/1524/files/korafamamodubaneligid.pdf
    • https://cdn.shopify.com/s/files/1/0437/3217/2951/files/autoestima_psicologia.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_off00007933.bin
edc11d1b89d507c03901c12625dac8f0a611e0fa25f9b10f6c900ce7a5981e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7933 5620 bytes
font_01_sfnt_off00008c41.bin
58131cfa6a1f1419eca26e2709038f639682e0d031ae2bbae5b76891fa5a9aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C41 11372 bytes

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