PDF malware analysis — malicious · d6fb57285d5befe8

MALICIOUS

PDF

104.9 KB Created: 2020-08-10 15:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b57fe262b1b99919012d2365d897a332 SHA-1: c64cd6f2d1c4c448a4845ed0cc7109d0c62455ef SHA-256: d6fb57285d5befe859dd4c06b6d9240cf05992902402176a3c6e80cc8c7ded04

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.com. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, with cdn.shopify.com being a dominant host. The ML classifier also strongly flagged this PDF as malicious. The embedded URL in the document body, https://ttraff.com/pify?keyword=binomial+coefficient+identities+pdf, is the primary indicator of malicious redirection.

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=binomial+coefficient+identities+pdf
- http://files.aprildavisfineart.com/uploads/1/3/1/3/131378975/040ae9adeebbb0.pdf
- http://files.khang-le.com/uploads/1/3/2/6/132683252/kigutofi.pdf
- http://files.dieseldoll.net/uploads/1/3/0/8/130814676/3878695.pdf
- http://files.midmichiganstays.com/uploads/1/3/0/7/130739596/bivurivomepen-sudipefuxawun.pdf
- https://cdn.shopify.com/s/files/1/0433/2997/8526/files/vugexowa.pdf
- https://cdn.shopify.com/s/files/1/0429/9993/9235/files/devunosipus.pdf
- https://cdn.shopify.com/s/files/1/0439/3598/9915/files/munoxaw.pdf
- https://cdn.shopify.com/s/files/1/0434/7327/2992/files/18642530063.pdf
- https://cdn.shopify.com/s/files/1/0434/9100/0472/files/u_tube_video_of_economy_tractor.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73875000904.pdf
- https://cdn.shopify.com/s/files/1/0432/4697/7179/files/24438619160.pdf
- https://cdn.shopify.com/s/files/1/0427/6230/5702/files/nomozebovawawuzasilorafij.pdf
- https://cdn.shopify.com/s/files/1/0432/2151/6449/files/siratupeda.pdf
- https://cdn.shopify.com/s/files/1/0431/4277/4938/files/exercices_corrigs_automatisme_industriel.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00013301.bin` `8deffb3a673d1209bd96d9eb36395534c7c8a7eec83e3c0b0cb67a6476a5a662`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13301	5256 bytes
`font_01_sfnt_off000144c6.bin` `173d9ec810e05f7588e6cdba63f83a9c46d305567d7cff8d8a3e27e609d78a32`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x144C6	17860 bytes
`font_02_sfnt_off00017cb4.bin` `ff4e42278974b1ba87f55d5a65275fdbbc967ba7318b55338de0f6e782d79a83`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17CB4	17336 bytes

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