PDF malware analysis — malicious · d3574ffbd9fc978a

MALICIOUS

PDF

45.5 KB Created: 2020-07-31 10:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1c0cd3e5f02a759d8d1137c803d23ffd SHA-1: 2a1300faf9d95764ec32d50418092318375d7d24 SHA-256: d3574ffbd9fc978ad1138ab430aed744b766f67cc23a85c344da8dfaf4f32f5e

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external PDF link farm, with one of the primary links directing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'basic cost accounting notes PDF'. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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.cc/pify?keyword=basic+cost+accounting+notes+pdf
- http://files.billstrom.ca/uploads/1/3/1/3/131380052/1864127eff24a74.pdf
- http://files.mimodelinginstruction.org/uploads/1/3/2/6/132695646/476123984.pdf
- http://files.permittechnation.org/uploads/1/3/1/1/131164016/72120.pdf
- http://files.seresearchcoalition.org/uploads/1/3/1/4/131438228/5807273.pdf
- http://files.lovebabiestennis.com/uploads/1/3/2/8/132814427/b037d404.pdf
- https://cdn.shopify.com/s/files/1/0434/8785/4749/files/ruvivunineg.pdf
- https://cdn.shopify.com/s/files/1/0430/5757/8137/files/42268348700.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/18491093394.pdf
- https://cdn.shopify.com/s/files/1/0434/5357/9430/files/32346638758.pdf
- https://cdn.shopify.com/s/files/1/0432/9370/4356/files/kexonemuvoroti.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51106899687.pdf
- https://cdn.shopify.com/s/files/1/0434/7609/1032/files/96770651814.pdf
- https://cdn.shopify.com/s/files/1/0438/2579/1138/files/74910833178.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_off000075c3.bin` `819b0413c966bb112f5179599f61f59cf07b37d1d94edea70e26b351b98344fb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75C3	5128 bytes
`font_01_sfnt_off0000873f.bin` `5e237b78ac128c98efed8e249f33588bc9b2dc5fff8a0d4d3d39ad1233bc7c31`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x873F	9836 bytes

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