PDF malware analysis — malicious · 75979944cde0962e

MALICIOUS

PDF

55.4 KB Created: 2020-08-16 23:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b7ce1a21fabd352d19afc233906025ab SHA-1: fc3c30e582d7967a48f310f4e1662fedda8b065f SHA-256: 75979944cde0962e75d0d477d30e650fd5b57a6412dd1ebd6af686e63cf23d54

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'biopsychosocial assessment template doc' and a URL that appears to be part of a link farm. The presence of multiple Shopify links, some confirmed benign and others unknown, suggests an attempt to blend malicious links with legitimate ones. The ML classifier also flagged this PDF as malicious.

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.ru/pify?keyword=biopsychosocial+assessment+template+doc
- http://files.engiellepaguican.com/uploads/1/3/2/6/132681812/1030394.pdf
- http://///www.ftc.gov
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0434/7399/3890/files/challenge_bhojpuri_movie_hd_video_songs.pdf
- https://cdn.shopify.com/s/files/1/0431/0820/4704/files/21782512178.pdf
- https://cdn.shopify.com/s/files/1/0437/5032/6426/files/kunikegobomiboteb.pdf
- https://cdn.shopify.com/s/files/1/0431/9258/2293/files/74973853274.pdf
- https://cdn.shopify.com/s/files/1/0432/6011/7160/files/58167709829.pdf
- https://cdn.shopify.com/s/files/1/0431/7026/7291/files/masedubadotuzubixilod.pdf
- https://cdn.shopify.com/s/files/1/0431/7875/4199/files/37667318035.pdf
- https://cdn.shopify.com/s/files/1/0431/7485/4812/files/modern_control_systems_11th_edition.pdf
- https://cdn.shopify.com/s/files/1/0433/7080/7459/files/jepekuma.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00009950.bin` `cf73dc71f8181e1ac61b20d505200d5e59cfb1467b702d366382159516956a68`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9950	5368 bytes
`font_01_sfnt_off0000ab6e.bin` `c496dd19601b14b84c15f89642727564bcfacd44a92342da2a3bd03eea2c3719`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAB6E	11196 bytes

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