PDF malware analysis — malicious · f37d444d6c0a1f38

MALICIOUS

PDF

44.2 KB Created: 2020-07-29 16:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a3d0e49dca98858a4e1da08dc69b6e57 SHA-1: f162249f74bc3c82ba193a035a1f1755018e1877 SHA-256: f37d444d6c0a1f3893e389daada2461474bff625b06779ea8bf369834a61b3f7

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'mathematical aptitude questions and answers pdf in tamil'. The PDF_SEO_LINK_FARM heuristic further suggests the document is part of a larger scheme to generate traffic to external sites. The primary malicious IOC is the redirector URL.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=mathematical+aptitude+questions+and+answers+pdf+in+tamil
- http://files.cravecavevaporlounge.com/uploads/1/3/1/0/131070313/konovinexi.pdf
- http://files.silviatomarchiophotography.com/uploads/1/3/1/4/131437139/fukuzof_kogagixita_wisev_dupuxo.pdf
- http://files.holytrinitywytheville.org/uploads/1/3/0/7/130740563/wuliva_woboxefine_zenetudidawoti.pdf
- http://files.englishzero.com/uploads/1/3/1/4/131437443/007ccb033f9533a.pdf
- http://files.silviatomarchiophotography.com/uploads/1/3/1/4/131437139/fukuzof_kogagixit
- https://cdn.shopify.com/s/files/1/0432/8125/2512/files/juwulizuwixu.pdf
- https://cdn.shopify.com/s/files/1/0435/7426/3963/files/63093568811.pdf
- https://cdn.shopify.com/s/files/1/0437/0428/7383/files/96558749248.pdf
- https://cdn.shopify.com/s/files/1/0440/8023/4661/files/siwuwevusivol.pdf
- https://cdn.shopify.com/s/files/1/0430/6416/4506/files/89376349398.pdf
- https://cdn.shopify.com/s/files/1/0433/8860/0478/files/zefukozusi.pdf
- https://cdn.shopify.com/s/files/1/0430/6989/8914/files/24247214586.pdf
- https://cdn.shopify.com/s/files/1/0431/5054/0964/files/nagusegorogu.pdf
- https://cdn.shopify.com/s/files/1/0430/3175/6957/files/jukajafawifulu.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57955619809.pdf
- https://cdn.shopify.com/s/files/1/0431/5276/9192/files/razuwekemogikusuwipetudem.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_off00006ab3.bin` `a5f7a01863a0a1ba190fadc0d62c376c2bbc9024028c776fe856d7476344127e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6AB3	5500 bytes
`font_01_sfnt_off00007d52.bin` `8e16420f6d82bf142fc3fde50db4cf01df9e48a4b2ce8549d872ca6940e8de93`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7D52	11216 bytes

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