PDF malware analysis — malicious · fb877b2ec27f3c01

MALICIOUS

PDF

44.9 KB Created: 2020-08-31 18:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f0c3a49a291e92b66122d3296bec35a1 SHA-1: 03d5a5baf27d118ca38917234b5ca0a4f565bfc9 SHA-256: fb877b2ec27f3c01ed37e28e8bee50b0206ed0490e591c1984f4bf9e095b92ea

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF document contains embedded links that lead to a known malicious redirector. The document body text, though partially corrupted, suggests a lure related to a "scholarship acceptance letter format". The presence of numerous external PDF links, many pointing to Shopify domains, indicates a link farm strategy. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further 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.ru/pify?keyword=scholarship+acceptance+letter+format
- https://cdn.shopify.com/s/files/1/0440/8098/8325/files/5th_grade_science_staar_test_review.pdf
- https://cdn.shopify.com/s/files/1/0433/0225/6795/files/34111869956.pdf
- https://cdn.shopify.com/s/files/1/0428/4016/2467/files/wumisimubim.pdf
- https://cdn.shopify.com/s/files/1/0430/5253/1869/files/noxokivofemude.pdf
- https://cdn.shopify.com/s/files/1/0434/4777/9478/files/15665976608.pdf
- https://cdn.shopify.com/s/files/1/0432/2770/9597/files/taxixosijidide.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.pdf
- https://static.usrfiles.com/ugd/b8c837_0ddc64a6189e4df68c5b58a07307fed2.pdf
- https://static.usrfiles.com/ugd/b8c837_aa43855117d7412ab7489465ef3d455e.pdf
- https://static.usrfiles.com/ugd/808d8c_141d051d77d44f57842e1fdb664f20c3.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005b6f.bin` `6620fee96b965f9026c88ae93a030f3eaee16acd066f9721cf535f2a34013093`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B6F	5356 bytes
`font_01_sfnt_off00006d84.bin` `17b93ce170198345d2dbd30f356deac0c93504fa09ce5ec3fdc9674b504c332f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D84	10300 bytes
`font_02_sfnt_off000090e3.bin` `82ff1b67254b78c1ee0adf625a5874e83155b3daef551421cdcfc373801bb273`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x90E3	16436 bytes

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