PDF malware analysis — malicious · 0b68d0550724ecce

MALICIOUS

PDF

37.6 KB Created: 2020-09-08 07:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e9719d3879045bdf06631ac8538a7a30 SHA-1: 7e4c1b77fb5d50a242af0920bfadc2134eab6f7f SHA-256: 0b68d0550724ecce2ab7db3ce9be924c6e341bf17d7d10a00104f932585a22ad

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one prominently identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to 'Ielts listening pdf answer sheet' to entice users to click the malicious link. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm strategy to distribute the malicious content.

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.club/wix?keyword=ielts+listening+pdf+answer+sheet
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://www.daltonmaag.com/
- https://cdn.shopify.com/s/files/1/0434/2421/9293/files/dugomenovefozitenopome.pdf
- https://cdn.shopify.com/s/files/1/0431/2930/7293/files/27334794196.pdf
- https://cdn.shopify.com/s/files/1/0431/3533/6616/files/vemifeku.pdf
- https://cdn.shopify.com/s/files/1/0429/5675/1002/files/83525603581.pdf
- https://static.usrfiles.com/ugd/a382ee_41961c8f80474b97ae63e8cb885d328a.pdf
- https://static.usrfiles.com/ugd/35ddae_292b48421de34cf0aa179c736a4ba7ea.pdf
- https://cdn.shopify.com/s/files/1/0466/7955/6261/files/ffxiv_carpenter_leveling_guide.pdf
- https://cdn.shopify.com/s/files/1/0427/7580/6119/files/11661087849.pdf
- https://cdn.shopify.com/s/files/1/0430/7278/2489/files/40086133985.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_off00004945.bin` `2c117f8b3cbfafffb315e661377ef05f7dd56613148582297fb4a3b4f1fb3050`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4945	5008 bytes
`font_01_sfnt_off00005a47.bin` `7c49f28823c344c45647381b3d2cc92bb18805cc537676ea7d7dc3f6ae3cc2a7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5A47	9732 bytes
`font_02_sfnt_off00007ba6.bin` `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7BA6	4324 bytes

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