PDF malware analysis — malicious · 2281242dd76be6e0

MALICIOUS

PDF

39.5 KB Created: 2020-08-29 00:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0c603d34809a55a75c362357df4dcbbd SHA-1: 383313a510eb9b5e2a53e0cab67c4c8256a98d19 SHA-256: 2281242dd76be6e0e51ba05280adde6eabec7d0466373db0d3364f01c740c487

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user into clicking it. The presence of numerous external PDF links further supports a link farm or redirection strategy.

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=nvidia+geforce+210+specs
- https://static.usrfiles.com/ugd/b8c837_18983a5e8b1d4444844dd1e7efeed1f3.pdf
- https://static.usrfiles.com/ugd/b8c837_6a734cfefba04034afa32b3a9a67140d.pdf
- https://static.usrfiles.com/ugd/b8c837_f5f0b8d127c7440aa11bdf2ae9256a3a.pdf
- https://static.usrfiles.com/ugd/b8c837_07b7e67539e94b319f124c84ebc7e973.pdf
- https://static.usrfiles.com/ugd/b8c837_a58955b17278475283872132fe14e640.pdf
- https://static.usrfiles.com/ugd/b8c837_dbc1a33656694093b4b3582e9f56fbf5.pdf
- https://static.usrfiles.com/ugd/b8c837_57ce9fba7b8f487da62bb35dc16ce0a2.pdf
- https://static.usrfiles.com/ugd/b8c837_8d3269b0839740d79e79dbe27f89ce81.pdf
- https://static.usrfiles.com/ugd/b8c837_2dc5fa4aef0642abb8432000f11f9378.pdf
- https://static.usrfiles.com/ugd/b8c837_c79c3b56b2d8456cb416a272aa5cb81e.pdf
- https://static.usrfiles.com/ugd/b8c837_dd0e606da71a4719a4b2f28e19449558.pdf
- https://static.usrfiles.com/ugd/b8c837_d920c46c2f204f7398cc97e4174d14d6.pdf
- https://static.usrfiles.com/ugd/b8c837_38281d21d2b74252840743180cf1cba7.pdf
- https://static.usrfiles.com/ugd/b8c837_0d2c6123146c4d618dc198f64f0fa3c5.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_off0000587d.bin` `d8f3fa1b6985374738f7866d602d7090ccfef773927815c6d9a35314b1b97060`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x587D	5648 bytes
`font_01_sfnt_off00006bdf.bin` `25174b29a2fb08e1742c284907ec056e19ea4613c7f1388d50d97c1d1ce33749`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BDF	11732 bytes

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