Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ccd9536d24b6df…

MALICIOUS

PDF

41.0 KB Created: 2020-07-10 13:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 8e34df82b451b605232f8dddd64d4d4c SHA-1: 0e92352bc51f851844244a3357ac3cbf3bc9beda SHA-256: f5ccd9536d24b6dfef9d1bd2e19c6208a46baf45e239de3bbde408b1b502a005
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially garbled, indicates a lure related to an 'Ekg interpretation cheat sheet pdf'. The primary malicious link, https://ttraff.cc/wb?keyword=ekg%20interpretation%20cheat%20sheet%20pdf, is the most critical IOC, likely leading to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=ekg%20interpretation%20cheat%20sheet%20pdf In PDF document text
    • http://files.beyondstockwoodproducts.com/uploads/1/3/1/3/131383549/vumiwovurudin_valutu_jajagidapox_rasafobaxidog.pdfIn PDF document text
    • http://files.washk12internships.org/uploads/1/3/0/7/130775131/2e1a215b1ea3.pdfIn PDF document text
    • http://files.digitalanodyne.com/uploads/1/3/2/6/132696263/pumuw_kexupimixipo_poxerox.pdfIn PDF document text
    • http://files.uproarnationals.com/uploads/1/3/1/1/131164011/jigavevadibemij.pdfIn PDF document text
    • http://files.mindactionplan.com/uploads/1/3/1/1/131163853/8516787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://files.greenscape.us.com/uploads/1/3/0/7/130775076/9608704.pdfIn PDF document text
    • https://gedumim.files.wordpress.com/2020/07/70090809775.pdfIn PDF document text
    • https://wanuparuvev.files.wordpress.com/2020/07/vivuguke.pdfIn PDF document text
    • https://fovufer.files.wordpress.com/2020/07/xunajorusofisamerizoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64255738852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41697505155.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63016720996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/memew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6170 5196 bytes
SHA-256: fcd4e07f8bec1e1cc93d91f53fa9795cc34b40d4e923ae119bebbf0b07a2268e
font_01_sfnt_off00007310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7310 10580 bytes
SHA-256: 215084369899273a8856a70eea84c74e3de82e3d33052aaac81916c59d88cceb

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