PDF malware analysis — malicious · de99489380240274

MALICIOUS

PDF

54.2 KB Created: 2020-09-01 10:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0f7736d65fc64ce7f888df4120e4818c SHA-1: f6747aad0782a71f5fbdcdb543e1147abfaf6732 SHA-256: de994893802402746dfc75fada5e30f568bb419d016926be46e018e0ee875b64

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for an 'electrophilic addition worksheet'. The presence of numerous other PDF links suggests a link farm or a method to obscure the malicious destination. The ML classifier strongly indicated maliciousness.

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=electrophilic+addition+worksheet
- https://cdn.shopify.com/s/files/1/0429/4112/0679/files/pokemon_number_69.pdf
- https://cdn.shopify.com/s/files/1/0434/9784/8996/files/jazanatafax.pdf
- https://cdn.shopify.com/s/files/1/0430/9676/8673/files/english_bangla_dictionary_software_free.pdf
- https://cdn.shopify.com/s/files/1/0427/9674/4871/files/4847123080.pdf
- https://cdn.shopify.com/s/files/1/0433/1647/8110/files/filezijodolexifuvuputu.pdf
- https://cdn.shopify.com/s/files/1/0429/8529/1937/files/93403064218.pdf
- https://static.usrfiles.com/ugd/696b8a_940fa0d17df14c0ab372cdec351bda3e.pdf
- https://static.usrfiles.com/ugd/26481d_aa98a4e0f7b742fb83bae61e4a4e061a.pdf
- https://static.usrfiles.com/ugd/c162b3_cae8308c632249d08a7f90606390ee6f.pdf
- https://static.usrfiles.com/ugd/f0e51d_70a7c85cffe34d9cab24292e169d2077.pdf
- https://static.usrfiles.com/ugd/d3758e_6ef179cb5ac64aaca5229a91725e0802.pdf
- https://static.usrfiles.com/ugd/7d1dc9_7b47242b741241ff9c35dffbc3a410db.pdf
- https://static.usrfiles.com/ugd/c068f8_6a7400a06c7c42e987f71a6d1b409fc8.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_off000096d5.bin` `07f1a48910df3261566d2942862a704f2d86a359c08c3e1bcf8359530e5ed66e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x96D5	5276 bytes
`font_01_sfnt_off0000a8d2.bin` `a520a3f43dfdce92ac0dfbee2f186b79fcb29e40a92b1bffd60e3ee58c34420c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA8D2	10388 bytes

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