PDF malware analysis — malicious · e8dc6f891996a704

MALICIOUS

PDF

53.3 KB Created: 2020-10-15 05:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: 6fbf4f326e19681a807386b1d8910b91 SHA-1: ff1143fbb3b241325b3764bcb9cbf713e5f8ce08 SHA-256: e8dc6f891996a704d58645a8d39c3183aef319c2470ec603a4553db0d3862a47

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the one identified by the redirector heuristic, suggesting an attempt to lure users to potentially harmful content.

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://gettraff.ru/123?keyword=swordigo+mod+apk+unlimited+coins In PDF document text
- https://cdn-cms.f-static.net/uploads/4366381/normal_5f87689dc3e5b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366989/normal_5f87a4967a019.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365662/normal_5f870a8922d02.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366042/normal_5f86f4755131b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365525/normal_5f876ab0dbdeb.pdfIn PDF document text
- https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zakeme.pdfIn PDF document text
- https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/bb87f32975070a8.pdfIn PDF document text
- https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/18ad995.pdfIn PDF document text
- https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/8536469.pdfIn PDF document text
- https://rabexowubomisuw.weebly.com/uploads/1/3/1/4/131407155/netidopamaw.pdfIn PDF document text
- https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/kineratutajo-domonasapafi-rasogabime-talisanaki.pdfIn PDF document text
- https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/mekezarokojo.pdfIn PDF document text
- https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/7203631.pdfIn PDF document text
- https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/metor.pdfIn PDF document text
- https://site-1042017.mozfiles.com/files/1042017/bununufe.pdfIn PDF document text
- https://site-1039737.mozfiles.com/files/1039737/16602298971.pdfIn PDF document text
- https://site-1039725.mozfiles.com/files/1039725/86435273461.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366359/normal_5f878a1d2d568.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366376/normal_5f8761de33320.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366366/normal_5f87a8e0d6511.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367622/normal_5f8751e8c190e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366347/normal_5f87aa6937d87.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://cdn.shopify.com/s/files/1/0492/3080/7196/files/merging_multiple_worksheets_in_excel.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/5512/8477/files/xafivukegofax.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0435/3697/3975/files/pythagorean_theorem_riddle_worksheet_answers.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007bf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7BF9	5652 bytes
SHA-256: `19436e348532e54b8c58f8f4bee69db393c2894de887be9c12d4bafa0d05dedc`
`font_01_sfnt_off00008f2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F2F	10112 bytes
SHA-256: `0eae2c7f88dd1ea341a2d99681c29752d2904f3d967bb2e4421c4986699cd37c`
`font_02_sfnt_off0000b1f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB1F0	16228 bytes
SHA-256: `e41e91669d5d32dec27558b960489af2bd4a3db5ff0138660c5b21078d38605b`

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