PDF malware analysis — malicious · f5ab2a13d0b67702

MALICIOUS

PDF

35.1 KB Created: 2020-08-30 01:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 164717b952525cf6c104f33a703b878a SHA-1: ea485e697ac164926ceaa760bd011f54e28bd13a SHA-256: f5ab2a13d0b67702851ea531320679935f71cffc7d2b598a1e03596b5b21e332

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to an 'ecological succession lab worksheet answer key'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing attempts. The ML classifier 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/wix?keyword=ecological+succession+lab+worksheet+answer+key
- https://cdn.shopify.com/s/files/1/0430/9359/0167/files/tabla_alimentos_ricos_en_hierro.pdf
- https://cdn.shopify.com/s/files/1/0433/2086/9019/files/befafugerububa.pdf
- https://cdn.shopify.com/s/files/1/0432/5949/4555/files/rekawijesuvi.pdf
- https://static.usrfiles.com/ugd/238140_9223abbcee0248a585d60be6515e0866.pdf
- https://static.usrfiles.com/ugd/a1fb72_c8934a0ecaea4b0c868def51682a95ff.pdf
- https://static.usrfiles.com/ugd/b8c837_0855aecdad9f4b0aa0a1147d93c609aa.pdf
- https://static.usrfiles.com/ugd/b8c837_5256334a210048ee94a97f102978c2ba.pdf
- https://static.usrfiles.com/ugd/b8c837_2d2f71017b7a4a538eb74297e2e3cc00.pdf
- https://static.usrfiles.com/ugd/b8c837_e78df294ef654ab2b940ce7421fba450.pdf
- https://static.usrfiles.com/ugd/405339_d8ac4183dda0466f826f03a3f514600e.pdf
- https://static.usrfiles.com/ugd/3f80ec_d753b3c9537644e9a79badd9def842c4.pdf
- https://static.usrfiles.com/ugd/b0b521_b376bea564d2439caf4d556e6073bf84.pdf
- https://static.usrfiles.com/ugd/b8c837_920ece2f56c643e299f179c7d6249eb3.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_off00004afd.bin` `d552c7fe451b7d56fa5d67e13aae14351c588eddde0c6a3910d21a87829734bf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4AFD	5416 bytes
`font_01_sfnt_off00005d77.bin` `96fa72efe385a1c4ad1dd082a1bd835fc01014761f6531351c448731a8252fa1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D77	10028 bytes

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