PDF malware analysis — malicious · 957f6c4bbade4aba

MALICIOUS

PDF

39.3 KB Created: 2020-08-22 07:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 155f143d6d3c47fce1098ef2f155d47c SHA-1: 90471de3bd8c4169fc1978d662f4dd796a05b74d SHA-256: 957f6c4bbade4abad4405e0159d674d095a2e371d2d417d809bc4b49bf123007

154 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is embedded within the document body, disguised as a link to healthcare standards. The PDF also exhibits a link farm behavior, with numerous embedded links to external PDFs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering via a deceptive link.

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=national+standards+for+safer+better+healthcare+pdf
- http://files.dorseyreunion1967.com/uploads/1/3/1/4/131437655/fupodaf_suwazesodufasof.pdf
- http://files.greenearthtravel.com/uploads/1/3/1/4/131452846/5868681.pdf
- http://files.mstravelexec.com/uploads/1/3/1/6/131606789/926f2101.pdf
- https://cdn.shopify.com/s/files/1/0428/2423/7212/files/jeluvewikexivipukomoja.pdf
- https://cdn.shopify.com/s/files/1/0428/2220/5607/files/lakes.pdf
- https://cdn.shopify.com/s/files/1/0429/9236/9823/files/wofunebifutifojuxamulaja.pdf
- https://cdn.shopify.com/s/files/1/0431/7839/3764/files/html_editor_app_for_android_phone.pdf
- https://cdn.shopify.com/s/files/1/0436/0005/2387/files/how_to_ace_the_pilot_technical_interview.pdf
- https://cdn.shopify.com/s/files/1/0432/4275/0114/files/psychology_articles_free.pdf
- https://cdn.shopify.com/s/files/1/0435/5650/3707/files/cheat_sheet_infographic_meaning.pdf
- https://cdn.shopify.com/s/files/1/0443/1472/2460/files/ccna_200_125_free_download.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_off00005b4f.bin` `fb85f3ad4112a7c3d1113ed2db6c1dd9a1436f608ee7d7284e37601407cfd3fa`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B4F	5352 bytes
`font_01_sfnt_off00006d70.bin` `07db374522abbb784230912678d0b2856cdaec62c90c1d4f4b709f714e712db3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D70	10372 bytes

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