PDF malware analysis — malicious · c895abd397115d19

MALICIOUS

PDF

54.3 KB Created: 2020-09-01 01:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 08615a0bdaddc54eb906833983bdf60c SHA-1: 0d1ae13a6e304efd7fc8f507f435ea4f799fe26d SHA-256: c895abd397115d191625715ba7c4b0f66aa1e83f5b985abfbf7994445aa50152

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded links, including one pointing to a known malicious redirector at 'https://ttraff.cc/wix?keyword=poison+frogs+chytrid+fungus+worksheet'. The document body, though heavily obfuscated, appears to be a lure, presenting itself as a worksheet. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector confirms the intent to lead the user to a harmful destination.

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=poison+frogs+chytrid+fungus+worksheet
- https://cdn.shopify.com/s/files/1/0438/1474/8322/files/argent_crusade_tabard.pdf
- https://cdn.shopify.com/s/files/1/0429/5540/7511/files/jexomovupofu.pdf
- https://cdn.shopify.com/s/files/1/0432/7433/8472/files/nolemivosodot.pdf
- https://cdn.shopify.com/s/files/1/0457/7686/3398/files/textfx_notepad_64_bit_download.pdf
- https://static.usrfiles.com/ugd/2e4eb4_729c092e416d4978a278abbc8166e852.pdf
- https://static.usrfiles.com/ugd/b7306e_72c14fefa2f84a30b74e84fd3a435c96.pdf
- https://static.usrfiles.com/ugd/12dc78_d1e44af9cc204b24bf8891192645a236.pdf
- https://static.usrfiles.com/ugd/ba3095_0313b2d2d8b0453aae8ae8f56bed8c31.pdf
- https://static.usrfiles.com/ugd/b8c837_cc22890e19354a8c95a814f9dc2f3ac0.pdf
- https://cdn.shopify.com/s/files/1/0429/0235/6127/files/vupivalawu.pdf
- https://cdn.shopify.com/s/files/1/0437/1690/3080/files/xamepitasobusokegovigix.pdf
- https://cdn.shopify.com/s/files/1/0429/6550/0060/files/90226752589.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_off0000958b.bin` `7206ae6e32c7565f734b30040afb919cf6e33d0a5f2f5380d7c6197f430ffdb3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x958B	5300 bytes
`font_01_sfnt_off0000a7ad.bin` `fd560fb01e96f060d0dac4f43002b6fc451d60a93d7bad5698a5cdbd01079660`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA7AD	11076 bytes

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