Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c20e7225269a25…

MALICIOUS

PDF

42.1 KB Created: 2020-09-11 03:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d4568599acfcf1c81b7ff537ccc9cc SHA-1: 790730499f0808ecfdd63b0fb61d06de8b9fbe6b SHA-256: 80c20e7225269a25337a03ad87e1fed30d33621c42589fa467afa5c3379c5aa8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on various domains, many of which appear to be part of a link farm. One URL, 'https://ttraff.club/pify?keyword=rockets+vs+grizzlies+injury+report', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to external content, potentially for SEO manipulation or to serve further malicious payloads.

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.club/pify?keyword=rockets+vs+grizzlies+injury+report
    • http://guzap.kymgeorgeartdolls.com/uploads/1/3/0/7/130775557/berigalegukugiritene.pdf
    • http://files.newrichmondoh.org/uploads/1/3/0/7/130739699/1970023.pdf
    • http://butubelar.bonuselkantler.com/uploads/1/3/1/4/131437299/napunusomubuzu.pdf
    • http://pifuwiw.cotamtb.com/uploads/1/3/1/4/131409090/dodagesa.pdf
    • http://files.williamjewsbury.com/uploads/1/3/0/7/130776037/db870cf09b7.pdf
    • http://sabijafi.alittlepeaceayurveda.com/uploads/1/3/0/7/130775388/4741573.pdf
    • http://jebipumij.alibraryisonfire.com/uploads/1/3/0/8/130874038/2657894.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/fuvupipuxusepedofofofa.pdf
    • https://cdn.shopify.com/s/files/1/0459/0433/0906/files/degividubexofupinir.pdf
    • https://cdn.shopify.com/s/files/1/0436/6453/9798/files/bunitaleluraviraz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/pizugapemax.pdf
    • https://cdn.shopify.com/s/files/1/0429/1906/7815/files/lukinifewupiw.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_off00006565.bin
ff15e6b1936f1ef9a2e5eecc837a647ed3385957574b39220b95f32271cdce6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6565 5248 bytes
font_01_sfnt_off00007780.bin
59a84bdd95f3a78bdc06149b1e40878b9625b9a5c7ce7cdd4de3164ee3541760		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7780 10624 bytes

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