PDF malware analysis — malicious · 9cb3e2e98dcff8d4

MALICIOUS

PDF

39.7 KB Created: 2020-09-01 19:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ddcbe95c47d25e3136d0e26af3bcb50a SHA-1: 1968abcb47d5c3667b59584054032c8341448ee7 SHA-256: 9cb3e2e98dcff8d4520f01d63d0c82bba98c71bf23a4a9bb0abb2192be8b79fa

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a machine learning classifier and contains a link farm with 24 external PDF links. One of the primary links, https://ttraff.com/wix?keyword=conjunction+exercise+for+class+6+pdf, points to a known malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting a lure to trick users into clicking through to 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.com/wix?keyword=conjunction+exercise+for+class+6+pdf
- https://cdn.shopify.com/s/files/1/0430/0413/3525/files/cydia_full_version_ios_12._2.pdf
- https://cdn.shopify.com/s/files/1/0437/1929/5130/files/84506884766.pdf
- https://cdn.shopify.com/s/files/1/0434/5207/2086/files/vunujanalotokugine.pdf
- https://static.usrfiles.com/ugd/07625c_0f8c54eb35594adf8dab6063d4eff490.pdf
- https://cdn.shopify.com/s/files/1/0429/6369/7817/files/fanajineloramazodisuva.pdf
- https://cdn.shopify.com/s/files/1/0430/3942/4669/files/82100990294.pdf
- https://cdn.shopify.com/s/files/1/0469/4438/7233/files/elementos_de_una_empresa_ejemplos.pdf
- https://static.usrfiles.com/ugd/493135_6779b958b58341839fc033634797072f.pdf
- https://static.usrfiles.com/ugd/5bb01c_24515c6e384a4fdd81718955fc271c1e.pdf
- https://static.usrfiles.com/ugd/370b54_bd8700e85e714e16b825060cbfd4919a.pdf
- https://static.usrfiles.com/ugd/01e791_d3da6c7ae067424f91d3b48275ea1447.pdf
- https://static.usrfiles.com/ugd/ee9d3f_77281583cea944b6ae59eb9f68cfffc6.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_off00005dd0.bin` `2bd3fba9bc9cffaa71b7d942bffc2c8c794c69dcf0c9e7803ee921df85047a68`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5DD0	5352 bytes
`font_01_sfnt_off00007018.bin` `fabb451d052c61d3041cc97405f665b2ec76bf257140dee71a14d6436c160cea`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7018	9980 bytes

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