PDF malware analysis — malicious · 911f3e1ca3500dd5

MALICIOUS

PDF

37.3 KB Created: 2020-08-20 07:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: cb93d437f720e0c3f06eb5ab7e028be5 SHA-1: 0a16d747600b98a0915ad15343f71e72c1c94c89 SHA-256: 911f3e1ca3500dd52c36ce6f1acc0f6c19bffa8c03ae98270e57562b63e2e210

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains but are likely part of a link farm to obscure the true malicious destination. One critical heuristic identified a direct link to a known malicious redirector, ttraff.com, which is used to lure users with search terms like 'pathologie du tube digestif pdf'. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the primary attack vector is the malicious redirection embedded within the document.

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.
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.
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.com/pify?keyword=pathologie+du+tube+digestif+pdf
- http://files.cookschoicehoney.com/uploads/1/3/2/7/132740541/konefivaberofuri.pdf
- http://files.goodtimesgv.com/uploads/1/3/1/1/131164386/ziwav.pdf
- http://files.homecastaways.com/uploads/1/3/1/4/131408103/kozofubirowe.pdf
- https://cdn.shopify.com/s/files/1/0429/2011/6380/files/41160255944.pdf
- https://cdn.shopify.com/s/files/1/0429/7061/1871/files/assalamu_alaikum_alaikum_salam_song.pdf
- https://cdn.shopify.com/s/files/1/0427/9749/8535/files/desurefipiburibosuwilulo.pdf
- https://cdn.shopify.com/s/files/1/0437/8116/1121/files/vubipubefoduwar.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufabolip.pdf
- https://cdn.shopify.com/s/files/1/0428/1411/1903/files/rent_to_own_contract_template_california.pdf
- https://cdn.shopify.com/s/files/1/0446/6386/5497/files/xagozujajo.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000052e5.bin` `d1435ca5776f7f56b8f4d9aa5096442dd3641e1a269669864ce0d44e0b8467bd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x52E5	5348 bytes
`font_01_sfnt_off0000650b.bin` `e8a32aa8154a04f0335fe96502911ac5bc83fa0c016d888487f0debc05ca7baa`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x650B	11096 bytes

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