PDF malware analysis — malicious · 61f177a81449b532

MALICIOUS

PDF

41.6 KB Created: 2020-08-20 01:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 6a42ea7ce4c3224091b308f9786a84c0 SHA-1: b791768925da03dee5ce7054a03b7342a3d89922 SHA-256: 61f177a81449b532699369fc6a2883d6bffe3a75e69a287b67ed97517e4351f6

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. The primary link directs users to a known malicious redirector infrastructure, suggesting an attempt to lead victims to malicious content. The ML classifier also strongly indicated maliciousness.

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/pify?keyword=annals+of+clinical+and+medical+case+reports
- http://files.devikafernando.com/uploads/1/3/1/1/131164011/gifijipowipi.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0428/6870/3398/files/cyanobacteria_download.pdf
- https://cdn.shopify.com/s/files/1/0429/1146/5638/files/tamil_calendar_july_2020.pdf
- https://cdn.shopify.com/s/files/1/0431/5637/3670/files/44557896831.pdf
- https://cdn.shopify.com/s/files/1/0433/0618/8955/files/87630065375.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
- https://cdn.shopify.com/s/files/1/0433/0412/4580/files/18615785657.pdf
- https://cdn.shopify.com/s/files/1/0431/2023/0564/files/15517717496.pdf
- https://cdn.shopify.com/s/files/1/0431/9094/3902/files/bstc_answer_key_26_may_2020.pdf
- https://cdn.shopify.com/s/files/1/0433/2178/6521/files/16402263603.pdf
- https://cdn.shopify.com/s/files/1/0433/7994/9718/files/15154787810.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/
- http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005919.bin` `0bbf245cdcceb1b3ba7dd474134b1a05cef801f806a4dea3df841026b2d14704`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5919	3692 bytes
`font_01_sfnt_off00006630.bin` `561234314d3517e58b4c26033a7dcf0967c2cd9a3ebd0db6a12514e165b88079`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6630	5288 bytes
`font_02_sfnt_off0000780f.bin` `58c542e734e5662694260a6b26b9492d76e1741344e93c5515be1474432d2111`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x780F	9676 bytes

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