PDF malware analysis — malicious · 6b6d54f3ce9e1497

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 00:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 6aaf78f8cdc53afb5fc101a20d9982da SHA-1: 51b59f431bc18ba7b731da15c0761559f86dfd7a SHA-256: 6b6d54f3ce9e1497ab7521c709420015b3e35899174f4ebcc7e46be5937fca5f

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, disguised as information about an Army retention bonus. The PDF also hosts a large number of external links, many of which point to benign PDF files, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the embedded URL is a primary indicator of malicious intent.

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/wix?keyword=army+retention+bonus
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/b8c837_ffe5f4d356c04db99c343782e2aaf3dc.pdf
- https://static.usrfiles.com/ugd/b8c837_ad32f1790ac84b249115abf8fa40ad1a.pdf
- https://static.usrfiles.com/ugd/0049ca_cda32a900b514c5ead5f303cda1e43df.pdf
- https://static.usrfiles.com/ugd/b8bbd7_a75e46e6438345398db901521dac92ef.pdf
- https://static.usrfiles.com/ugd/b8c837_4101ce32e5ee4723949f5e8fc928234a.pdf
- https://static.usrfiles.com/ugd/b8c837_ff72808bf56a467499be93704337857a.pdf
- https://static.usrfiles.com/ugd/4b68be_585236022f2b4cdcb457c325c4e0aa83.pdf
- https://static.usrfiles.com/ugd/9374a7_dfd53eba8db740cfbb687d3f0680d37b.pdf
- https://static.usrfiles.com/ugd/ea5d7b_815facb080e549ba995226624461bd01.pdf
- https://cdn.shopify.com/s/files/1/0447/2363/4330/files/ansiedade_3_cimes_augusto_cury.pdf
- https://cdn.shopify.com/s/files/1/0434/1645/3272/files/m_p_shield_40_cal_performance_center.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_off00005ea1.bin` `28fd73bbceddc081ca07a3b252b8d31e383344bebd05e18a420ef79bfbe94b31`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EA1	4820 bytes
`font_01_sfnt_off00006ef1.bin` `04fba68f5a2e7338da42eec669cdf95e192325017a4f5d799aa7a96346095ff7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6EF1	10532 bytes

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