PDF malware analysis — malicious · 8cd83bbb89d7d22a

MALICIOUS

PDF

36.9 KB Created: 2020-08-31 15:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e0975304533aa6a89dbe30ab3eb2b589 SHA-1: 8f2aea569edf0af3c3fe35340907d4a582c6b3bc SHA-256: 8cd83bbb89d7d22ac188cbab4b15b9e0760c96204341aff01b1a438440fed731

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as an ESL classroom rules worksheet. The ML classifier strongly indicated maliciousness. The document body and embedded links suggest a lure to a malicious redirector, likely for phishing or malware distribution. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm strategy to improve SEO for 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.link/wix?keyword=classroom+rules+worksheet+esl
- https://cdn.shopify.com/s/files/1/0433/8489/7692/files/texas_precalculus_textbook_answers.pdf
- https://cdn.shopify.com/s/files/1/0437/4652/5338/files/5463338281.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1028728638.pdf
- https://static.usrfiles.com/ugd/934fc3_9d0379c1ad4b4e3b8fb418e5ff684627.pdf
- https://static.usrfiles.com/ugd/39cb9d_2b829dfff9964f7299f4a4d5758f064f.pdf
- https://static.usrfiles.com/ugd/9734e7_e69189b1e7c9482fa930e47c40f31354.pdf
- https://static.usrfiles.com/ugd/b8c837_ca90cdc4ee4248cb9a02fae74eff77a1.pdf
- https://cdn.shopify.com/s/files/1/0429/5933/9674/files/58674037135.pdf
- https://cdn.shopify.com/s/files/1/0432/2466/2173/files/sibipusotemufuzet.pdf
- https://static.usrfiles.com/ugd/d1c05f_9fa8978989c44f59a6118d354af8b4e8.pdf
- https://static.usrfiles.com/ugd/89064d_520c520e2af4449e859d94d41241c2bb.pdf
- https://static.usrfiles.com/ugd/c1108c_4b00ab863a0248f386c903e80f2ccd87.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_off000053fa.bin` `2ea87e3dc6ae205f8ffdd847c3c4529a68bbece5469aafa300239c77664abd90`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53FA	4984 bytes
`font_01_sfnt_off000064cb.bin` `6fbcccbf225f95e92e68a97dd5e38b8df8fa25a0232501278ba06a460f4a80fc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64CB	10192 bytes

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