PDF malware analysis — malicious · ca73ac6a5fc92014

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 21:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f398a4d0f599fdc99f1866d41d4b8c2b SHA-1: 87a22d47c6c2fd6e69d177edfac1f9e3e0908bd7 SHA-256: ca73ac6a5fc920143315939ab28b24b4089c193750f27978c03bc181f1713704

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass external link farm, with a primary malicious redirector URL disguised as a "free course" lure. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to external PDFs, reinforcing the link farm heuristic.

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.cc/wix?keyword=cinema+4d+free+course
- https://static.usrfiles.com/ugd/b8c837_4f8db4302e5f4fa99060525ba0e440dd.pdf
- https://static.usrfiles.com/ugd/3e87bf_a1e9fd41bcc04932b2d14cc4b008616c.pdf
- https://static.usrfiles.com/ugd/b52961_5026d131120a4b2a9b851780fd398fbe.pdf
- https://static.usrfiles.com/ugd/b8c837_590d85f9c2764883a46befadc1e87379.pdf
- https://cdn.shopify.com/s/files/1/0430/2818/5239/files/diborogokuvoradipini.pdf
- https://cdn.shopify.com/s/files/1/0428/5195/8947/files/zupoxabowo.pdf
- https://cdn.shopify.com/s/files/1/0433/9784/1063/files/answer_congratulations_email.pdf
- https://cdn.shopify.com/s/files/1/0428/1381/6995/files/hyundai_accent_service_manual.pdf
- https://cdn.shopify.com/s/files/1/0428/8171/2287/files/xiverujoravabiramuso.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bovabokuvuxinapuwukiberem.pdf
- https://cdn.shopify.com/s/files/1/0433/9679/2471/files/47617191732.pdf
- https://static.usrfiles.com/ugd/b8c837_b53e9525bd1749be8c2034ce0e38c3fb.pdf
- https://static.usrfiles.com/ugd/b8c837_f1a4742eb5d045ea850a6c93b6a45d7b.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_off00006006.bin` `df346a11ed975ce6fd5a360cedda934fc69c5f491905e96a42e1d09b9650a715`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6006	5128 bytes
`font_01_sfnt_off00007158.bin` `98f1f0ea49972e44f6c1da5406a979230becef6bb11b0b618fe71675b0c11d90`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7158	10052 bytes

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