PDF malware analysis — malicious · e36dcc1837725b2d

MALICIOUS

PDF

40.0 KB Created: 2020-08-29 23:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c53238fbf84988000498bd35c4f94651 SHA-1: 13acefca8c3328a43592848c4465ee3c167eeb42 SHA-256: e36dcc1837725b2d516b22fede9509fcff3b525e5355ed9c69ec2216e6aaf601

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains text suggesting it is a 'sap abap tutorial pdf free', likely a lure. The presence of multiple external PDF links, many pointing to 'static.usrfiles.com', suggests a link farm or SEO poisoning tactic to increase visibility and drive traffic to the malicious redirector.

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.ru/wix?keyword=sap+abap+tutorial+pdf+free
- https://static.usrfiles.com/ugd/b8c837_f6b64974eaf54542941a3648d5c078bc.pdf
- https://static.usrfiles.com/ugd/9b5f63_22e99c447706460ab50b38093426b051.pdf
- https://static.usrfiles.com/ugd/0c41e7_3f688d22f18a43febc79c94565f2a180.pdf
- https://static.usrfiles.com/ugd/52b593_cdab9aff833348f5bdc2b42fc115abc4.pdf
- https://cdn.shopify.com/s/files/1/0430/8713/4882/files/mapa_geografico_de_bolivia.pdf
- https://cdn.shopify.com/s/files/1/0433/8617/5651/files/58498429593.pdf
- https://cdn.shopify.com/s/files/1/0435/8828/8675/files/baixar_jogos_para_android_hackeados.pdf
- https://static.usrfiles.com/ugd/b8c837_ca669c5e18164dc7b1772e1030984331.pdf
- https://static.usrfiles.com/ugd/b8c837_139a9c5d3b4441b29ca999ea5cdc596e.pdf
- https://static.usrfiles.com/ugd/b8c837_607e5fb06bcc44f8b07ec7d86fae0efb.pdf
- https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.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_off00005e8d.bin` `70496e894aff9f905d1e3fa89b4203fa80deab5f85cc85fa97dbcba31c591423`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5E8D	5100 bytes
`font_01_sfnt_off00006fe9.bin` `2b20a99277743ab704ac5c923d301ccb5dfe0c49776251948d33b1343a0c3988`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FE9	10504 bytes

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