PDF malware analysis — malicious · 1d40f73b4b664cbc

MALICIOUS

PDF

55.2 KB Created: 2020-10-30 18:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15

MD5: cf9d1cfe9843ee17b336e3f7ec1de91d SHA-1: a5cabaf335e0ca4cc98a7bbfe84dd2e98d221f9b SHA-256: 1d40f73b4b664cbc0eb3d5a4e9bfcee353a505aef33bc967efd6d182d610dda8

134 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://ggtraff.ru/pify?keyword=algebra+2+and+trigonometry+amsco+answers In PDF document text
- https://cdn-cms.f-static.net/uploads/4368242/normal_5f89d6599f2c1.pdfIn PDF document text
- https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/rudupopurumit.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365600/normal_5f875e69d1c6a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415291/normal_5f969411c2d6c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379744/normal_5f8bc8a8c743f.pdfIn PDF document text
- https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/katipide.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368479/normal_5f8ac25ed016b.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/gupuso/30382059064.pdfIn PDF document text
- https://s3.amazonaws.com/sifawekujiki/sofebate.pdfIn PDF document text
- https://s3.amazonaws.com/nigimul/vetibusapoxi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000093ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x93EC	5716 bytes
SHA-256: `532e4e203e3e96c6f9b4deb72db9d0ecce5bd3f95d6657608ea7b08bc3d6af28`
`font_01_sfnt_off0000a75a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA75A	11868 bytes
SHA-256: `77453ef41f2f58edcad34ebff7dc4701f7fb92bfa74b514bdf598c8c1c6ca981`

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