PDF malware analysis — malicious · ca1c62340bb196d5

MALICIOUS

PDF

44.8 KB Created: 2020-09-01 00:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 232ef621c8674ee330a24484212bc27b SHA-1: 6f4d25845f9f8c6e567a1282d909f0a01f286b1f SHA-256: ca1c62340bb196d596cf08b40407858beb9b0573f20c41bd3513dc1e0af32acc

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'common core math' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also 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.ru/pify?keyword=common+core+math+5th+grade+pdf
- https://static.usrfiles.com/ugd/3e87bf_475f3ad1008c424a9299cf58b6920d15.pdf
- https://static.usrfiles.com/ugd/9421c8_8b3e25d5f8c940c98af099b2e8ab6c5d.pdf
- https://static.usrfiles.com/ugd/19ce5d_4b83808250b54ef6b8bda38fa7509827.pdf
- https://static.usrfiles.com/ugd/b8c837_ee0a549f8692443f815821bb22e3288c.pdf
- https://static.usrfiles.com/ugd/a6e5e9_0b6a43b5f004455e8b3e8b657ac7e4e3.pdf
- https://static.usrfiles.com/ugd/7ff653_063916c8b52d4af1a28a67d08a2f46a7.pdf
- https://static.usrfiles.com/ugd/784815_2a0c33007d9440b19e09d2db8d47b3b6.pdf
- https://static.usrfiles.com/ugd/d7ba0f_563a4557b710464ea32a18b5474ca3a4.pdf
- https://static.usrfiles.com/ugd/f1d680_0e73f9d6775842e7ac2b4255465e63c4.pdf
- https://static.usrfiles.com/ugd/b8c837_f7a6cfca65204dce83d680068a15a65a.pdf
- https://static.usrfiles.com/ugd/b8c837_d5f63a7967154f95b8721db2cec90a11.pdf
- https://static.usrfiles.com/ugd/b8c837_f0f034a21b39484ca9803036e72f6feb.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_off0000649b.bin` `40e0d82c29b0539ff41254b74e1ab87a87a7e7d7ecc8da2de95c5225461af8b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x649B	5244 bytes
`font_01_sfnt_off0000763e.bin` `b194fccb74bafe14e6f4314064e956052eaab5713f07f95fa893b4b616b8ba53`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x763E	10060 bytes
`font_02_sfnt_off00009889.bin` `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9889	4324 bytes

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