PDF malware analysis — malicious · 2b4be0d67a2d63cd

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 00:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1bc61d663e7ad52d0df40f3359733457 SHA-1: 6865924a4926eca55c3cf3feb3b0df3551c1e591 SHA-256: 2b4be0d67a2d63cdd43c0fcc6484953e933bfa2a975234f82bc5e5c4d4b38abe

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body text, though garbled, includes the phrase 'Inter 1st year english textbook pdf' and the malicious URL, suggesting a lure to trick users into downloading potentially harmful content. 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.cc/pify?keyword=inter+1st+year+english+textbook+pdf
- http://sanazaza.anglicanchurchholyspirit.com/uploads/1/3/1/3/131398140/d283c29.pdf
- http://wisafija.catarellaphoto.com/uploads/1/3/0/8/130873947/fejixelu.pdf
- http://mipilam.wnychamberorchestra.com/uploads/1/3/1/4/131437246/962949.pdf
- https://cdn.shopify.com/s/files/1/0434/5836/3544/files/kenimonapogozo.pdf
- https://cdn.shopify.com/s/files/1/0434/0006/9285/files/89891260522.pdf
- https://cdn.shopify.com/s/files/1/0430/9703/0817/files/6291857.pdf
- https://cdn.shopify.com/s/files/1/0438/3608/0288/files/gerodivipola.pdf
- https://cdn.shopify.com/s/files/1/0431/5106/5243/files/32624584711.pdf
- https://cdn.shopify.com/s/files/1/0431/6217/3602/files/25315437007.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
- https://cdn.shopify.com/s/files/1/0427/6515/6508/files/34824079870.pdf
- https://cdn.shopify.com/s/files/1/0432/2508/8168/files/sivav.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_off00004456.bin` `cea75e2799e769ba51f85a3ca845f8ae2206a1f0adb2d499d378f742cf12a9d1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4456	5668 bytes
`font_01_sfnt_off0000579d.bin` `765fc3405cee88424cff2c6e6c81961bf7a608ae56ae506c5bfc15e4d6637859`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x579D	13028 bytes
`font_02_sfnt_off000080b3.bin` `ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x80B3	16164 bytes

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