PDF malware analysis — malicious · d632bc1aa2336ec1

MALICIOUS

PDF

32.5 KB Created: 2020-08-31 05:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1ef78d4915ef096481c228d1ae5f2bbc SHA-1: afe124bbad72fa2835e49ac84e3cf2200a057b31 SHA-256: d632bc1aa2336ec1ffd6dfa7b039c22b953fba10df6132104b44e8b2331147c2

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to Shopify-hosted PDF files, which is indicative of a link farm. One of the primary links redirects to a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of numerous links suggests an attempt to manipulate search engine results or distribute further malicious content.

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/wix?keyword=calculus+early+transcendentals+6th+e
- https://cdn.shopify.com/s/files/1/0440/1712/3478/files/dixudulexek.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuxekenosagulowagegur.pdf
- https://cdn.shopify.com/s/files/1/0432/6886/6208/files/44087441229.pdf
- https://cdn.shopify.com/s/files/1/0428/8974/0441/files/mujizokovubozuxo.pdf
- https://cdn.shopify.com/s/files/1/0434/0147/8311/files/vojebojovutivokupu.pdf
- https://cdn.shopify.com/s/files/1/0435/9703/7730/files/55769666146.pdf
- https://cdn.shopify.com/s/files/1/0431/7318/3643/files/andis_clipper_blades_guide.pdf
- https://cdn.shopify.com/s/files/1/0434/6334/4280/files/38106874898.pdf
- https://cdn.shopify.com/s/files/1/0433/2588/2520/files/crippled_black_phoenix_great_escape.pdf
- https://cdn.shopify.com/s/files/1/0436/8980/3941/files/80565101816.pdf
- https://cdn.shopify.com/s/files/1/0430/7304/4642/files/57943148379.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_off0000420e.bin` `9452f7827949162dee35c7302722a0118631b72ed4f736adddc841df59778668`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x420E	5188 bytes
`font_01_sfnt_off000053ac.bin` `3200a053b837aac1be4d37bebdb3ae03d26c6bcdcd70bfb27dfee1f7cba399d0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53AC	9892 bytes

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