PDF malware analysis — malicious · 2f04879ff40ae046

MALICIOUS

PDF

46.2 KB Created: 2020-08-29 01:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 14ef1bcbb85224f8f7ef53684f0184f1 SHA-1: c73bba95b21a5a8b9c9cc5a2b5c9624316b18440 SHA-256: 2f04879ff40ae046566d18a45ab74186b9a05d437ab4e537462b67a483ce181c

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector URL (ttraff.ru) that is flagged as malicious. The document body, though heavily obfuscated, contains references to "moles worksheet answer key" and the malicious URL, suggesting a lure to trick users into clicking the links. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=moles+worksheet+answer+key
- https://static.usrfiles.com/ugd/b8c837_7bcd9a625cd74dc1851783277a9d238b.pdf
- https://static.usrfiles.com/ugd/b8c837_69ac3770fcc0410eac93eacff9e17f07.pdf
- https://static.usrfiles.com/ugd/b8c837_b7986fea166447f2bef36cc63bf9d71c.pdf
- https://static.usrfiles.com/ugd/b8c837_269a0ae271c24819a837d7c986639da6.pdf
- https://cdn.shopify.com/s/files/1/0433/4164/3928/files/lotawamisuzepu.pdf
- https://cdn.shopify.com/s/files/1/0435/4398/6330/files/52502338205.pdf
- https://cdn.shopify.com/s/files/1/0437/6179/5229/files/nivanek.pdf
- https://cdn.shopify.com/s/files/1/0428/1283/3959/files/lonubakite.pdf
- https://cdn.shopify.com/s/files/1/0435/9890/5507/files/tokudotube.pdf
- https://cdn.shopify.com/s/files/1/0437/0078/1208/files/lavigadidoxow.pdf
- https://cdn.shopify.com/s/files/1/0440/7053/5318/files/seat_of_the_soul.pdf
- https://cdn.shopify.com/s/files/1/0430/5892/1621/files/dapudumemasigova.pdf
- https://cdn.shopify.com/s/files/1/0431/4395/4594/files/wutumumaguvux.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_off00007764.bin` `dbb57004ff90fc39eed305ce943bef41aca67f872a3f1969d6cb682999dea813`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7764	5036 bytes
`font_01_sfnt_off0000889a.bin` `ec3b1c3e851bfa88ec0adefea815e77d66eb69247c58f7e2a2ae7c71ef6cd32b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x889A	10260 bytes

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